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post #16 of 30 Old 05-20-2011, 09:33 AM
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Despite modern attempts for consistency,all vehicles are still not manufactured equally..IMO. We've owned three Priuses (Prii...?), '05, '08, '10. The '08 got much worse gas mileage than the other two. Obviuosly, we love the Prius, but I get a sense that folks here are making excuses for the low MPG about which the poster is complaining. A close friend bought an '07, new, after riding in our '05. In town he consistently gets 55 to 60 MPG, high 40's to low 50's at highway speeds...not bad.
Our best mileage with the '10, was from Phoenix to Moab, cruise set at 72 MPH, 61.2 MPG. We were happy. Usually low/mid 50's in town.
Just returned from a 1900 mile trip to South Dakota from Wisconsin, and had some 38/40 MPG averages...hills...headwinds...bad gas...etc., but once in town it improved a lot.
Don't know what to suggest re: 38MPG 2010, but don't think it's right, and owner shouldn't have to jump through all the hoops suggested to get the MPG-or close-that
these cars are reported to get. That Prius may've been manufactured on a Friday...or a Monday.
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post #17 of 30 Old 05-21-2011, 05:25 PM
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Quote:
Originally Posted by jeedee View Post
.Don't know what to suggest re: 38MPG 2010, but don't think it's right, and owner shouldn't have to jump through all the hoops suggested to get the MPG-or close-that
these cars are reported to get. That Prius may've been manufactured on a Friday...or a Monday.
I agree with this. Ive taken many Prius on demo, and never failed to get at least 50mpg even when the cars have 0 miles on them. I don't drive it like a hybrid either, in fact I like to whip around corners and brake hard in them . They are fun to accelerate at WOT!! Remember, the EPA testers also drive them like they stole them, use the AC and have windows down ect.

Problem is, its IMPOSSIBLE to prove something is wrong with the car unless there is a fault code stored. The only thing you can do is get it reset and see if that makes any difference. Once in awhile, some cars are just not "right". My neighbor decided on an Accord during the Toyota recall fiasco, and his car has been getting poor mileage and all kinds of other issues, I tell him it's karma for skating me.
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post #18 of 30 Old 05-22-2011, 09:01 PM
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I'm a little biased

I love the Prius. One thing that I've found out is that they need a good balance of highway driving and city driving to get the best mileage. I had a customer with the same exact complaint as you and the same driving habits. You can't drive all or even most of the time in the city and expect the high city mileage from the window sticker. To "fix" the car, I took a test drive about 10 miles at 65 mph with her in the passenger seat. By the time we got back off the highway the MPG was way above what she had been getting. I then reset the guage and drove in the city for a few miles and it was getting at least near the high end (48-49 mpg).
When cars are tested for fuel economy, there is a balance of both city and highway. With a hybrid these numbers rely much more on the balance than staying in the city to try and get the best mileage. If you increase highway driving, I'm willing to bet you'll start seeing those great numbers immediately.
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post #19 of 30 Old 05-30-2011, 12:31 PM
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I have recorded & computed my mileage for every tank full for every car that I have ever owned. For my 07 Prius, I've averaged 49.1 mpg (computed), with a low of 32.2 and a high of 69.1 for a single tank of fuel, since mile1. The computed average of the displayed mpg is 50.5.

I'm not sure that "green leaf cars" (I think they look like little green turtles) necessarily indicate too much braking. Recharging also occurs w/o braking. Last week (after my 50K service, so everything was "in order") I noticed 5 "green cars" in a 25 minute span (5 min screen) while driving about 20 miles on a 2 lane rural state highway with very little braking. There were maybe 3 traffic lights (& very little traffic) during that time. A couple of days later there were 3 "cars" within 20 minutes while driving on an Interstate highway.

I suggest that you hit "reset" on the display when you fill up your fuel tank. That will reset both the mileage and mpg. I "think" that the mpg displayed keeps computing (from last reset). I also "think" that my mileage auto-resets after fueling . . . I always reset, so I don't remember. It takes very high mpg (over several tank fulls) to make even a slight increase in the average when the computation is spread over 10,000 miles. Maybe you just need to restart your calculations.
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post #20 of 30 Old 07-12-2011, 07:18 PM
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I have over 16,000 on my 2010 Prius II. The first tank was over 52 mpg. It keep going up after each fill up until I average 60 + mpg now.

The worst was at 75 mph into exceptionally strong head winds in the Dakota's on a trip. I gave 50.2 for that situation.

I stay in ECO mode and take off slow. I let off the gas well before a stop intersection. I don't do any extreme hyper mile tricks. Just regular conservative driving.

I have found the car does not like hills, head winds, heavy throttle application and contrary to the EPA findings, it does not do well in stop and go driving in the city.

I have consistently do better on the highway than city driving. I do know an owner who only drives city and gets 38 mpg like the OP.

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post #21 of 30 Old 08-09-2011, 10:54 PM
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Quote:
Originally Posted by JARHTMD View Post
I have recorded & computed my mileage for every tank full for every car that I have ever owned. For my 07 Prius, I've averaged 49.1 mpg (computed), with a low of 32.2 and a high of 69.1 for a single tank of fuel, since mile1. The computed average of the displayed mpg is 50.5.

I'm not sure that "green leaf cars" (I think they look like little green turtles) necessarily indicate too much braking. Recharging also occurs w/o braking. Last week (after my 50K service, so everything was "in order") I noticed 5 "green cars" in a 25 minute span (5 min screen) while driving about 20 miles on a 2 lane rural state highway with very little braking. There were maybe 3 traffic lights (& very little traffic) during that time. A couple of days later there were 3 "cars" within 20 minutes while driving on an Interstate highway.

I suggest that you hit "reset" on the display when you fill up your fuel tank. That will reset both the mileage and mpg. I "think" that the mpg displayed keeps computing (from last reset). I also "think" that my mileage auto-resets after fueling . . . I always reset, so I don't remember. It takes very high mpg (over several tank fulls) to make even a slight increase in the average when the computation is spread over 10,000 miles. Maybe you just need to restart your calculations.
The leaf cars only show regenerative braking and not recharge by the engine so i'm not sure how you're getting regen on the highway unless you are braking or even just coasting (1 min consumption screen will show 30kWh leaf cars while the 5 min cons. shows 50kWh per leaf car so keep in mind that the numbers the leaf car represents changes depending on which Cons. screen you're on).
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post #22 of 30 Old 08-14-2011, 11:53 PM
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Quote:
Originally Posted by Tideland Prius View Post
. . . (1 min consumption screen will show 30kWh leaf cars while the 5 min cons. shows 50kWh per leaf car so keep in mind that the numbers the leaf car represents changes depending on which Cons. screen you're on).
I only have 1 screen (Consumption, I think it is) on my 2007, so whatever each car represents. It is what it is. My point was that I get leaf cars w/o excessive braking, as was suggested in an earlier post.
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post #23 of 30 Old 08-22-2011, 12:04 AM
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The '07 Prius would've had 5 min consumption screens.

Oh it doesn't take much to regenerate 50kWh. (you said 5 in 25 so I assume ~1 leaf car per 5 min segment)
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post #24 of 30 Old 01-06-2014, 07:54 PM
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I know this is an old thread, but I've had a 2010 Prius for a year now, and we've never gotten over 44mpg. Ever. Only got 38mpg on the last tank. 90% city driving at speeds of 30 to 45 mph. The best I've ever gotten was 44 mpg on a interstate hwy trip of 600 miles, with the cruise set at 65. Bought it with 72K miles, now it has about 86K.

I've read all the poor gas mileage threads here (posting in this one because the OP had the same car and MPG as me) and have tried premium/non-ethanol gas, increasing tire pressure to 40lbs front and rear, ensuring the oil is synthetic 0w20 (changed it myself last time - just in case), new air filter, letting bicycles out race me from a stop to the next light, etc.

Nothing seems to make much of a difference. If I REALLY baby it in city traffic and go slower than molasses in Jan, coasting between lights, (getting outrun by bicyclists - literally) etc, I can get 44 mpg.

Don't get me wrong, 38 mpg isn't terrible, but it's basically the same as what I get in my 2002 ZX2 on the hwy at the same speed. Hell, it isn't that much better than my 4-banger '99 s10/5spd that gets 30 mpg hwy. I've always been able to beat the EPA estimates in ever car I've owned. Something has to be wrong... There are no codes, dealer says everything is fine. BS.

What else could possibly cause the mpg to be this low?
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post #25 of 30 Old 01-06-2014, 08:27 PM
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Where you drive?

Stop and go "city" driving requires a lot of starting of the ICE. You run on the battery for a while, then it needs to be charged so the ICE starts. Plus where you live and its climate demands for HVAC can affect mileage. Short trips mean the ICE engine is always warming up (remember the old cars with chokes so you could rich out the mix of air/fuel for starting. Modern fuel injection is more efficient but still...).

I use fuelly.com to compute my MPG, not the cars computer. And even it is sometimes wildly off because of the variability of a gas pump in one station versus another. Imagine the fuel shut off being just .1 gal off between pumps. But over dozens of tanks it gets it closer to right and you can see patterns. Where the weather got you, where being in a hurry cost you. Where having a full car and trunk cost you. I don't get at 72mph what EPA got at 55. But overall I'm close enough to the EPA figures not to worry. After all I'm getting twice what my prior same-function car got.
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post #26 of 30 Old 01-06-2014, 08:28 PM
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Quote:
Originally Posted by gkliethermes View Post
I know this is an old thread, but I've had a 2010 Prius for a year now, and we've never gotten over 44mpg. Ever. Only got 38mpg on the last tank. 90% city driving at speeds of 30 to 45 mph. The best I've ever gotten was 44 mpg on a interstate hwy trip of 600 miles, with the cruise set at 65. Bought it with 72K miles, now it has about 86K.

I've read all the poor gas mileage threads here (posting in this one because the OP had the same car and MPG as me) and have tried premium/non-ethanol gas, increasing tire pressure to 40lbs front and rear, ensuring the oil is synthetic 0w20 (changed it myself last time - just in case), new air filter, letting bicycles out race me from a stop to the next light, etc.

Nothing seems to make much of a difference. If I REALLY baby it in city traffic and go slower than molasses in Jan, coasting between lights, (getting outrun by bicyclists - literally) etc, I can get 44 mpg.

Don't get me wrong, 38 mpg isn't terrible, but it's basically the same as what I get in my 2002 ZX2 on the hwy at the same speed. Hell, it isn't that much better than my 4-banger '99 s10/5spd that gets 30 mpg hwy. I've always been able to beat the EPA estimates in ever car I've owned. Something has to be wrong... There are no codes, dealer says everything is fine. BS.

What else could possibly cause the mpg to be this low?
A weak or failing auxiliary (12V) battery will cause the symptoms you're describing except that you've had the problem for a year. At the very least. have it checked by a reputable mechanic to see if it is dying. You'd eliminate one more possibility.

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post #27 of 30 Old 01-07-2014, 06:22 PM
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Other things you could check include wheel alignment and maybe flushing out the fuel lines and spark plugs with fuel injector cleaner (just grab a bottle or two from the dealer and put it into a full tank and the other 2 tanks later).

38mpg to me is terrible considering that's what I get if when it's -30C or colder (All it takes is one or two days at those temps or colder and my tank average is a goner). My worst tank was 37mpg calculated and that's when it hit -46C at the airport (-35C in and around the city).

44mpg seems ok if you're not babying it and driving it like a regular car (so no consideration for heat or A/C consumption cause reducing the need for a toasty or ice cold interior will help increase fuel economy).


You should be around 47mpg at 70mph (give or take) and highway mileage smooths out the inconsistencies since you're at a steady speed and hopefully in reasonably flat terrain with minimal head or tail wind to mess up the calculation.

Have you tried a different station or different fuel company (you'll have to try it over several tanks to get an average).

Worse come to worse, you could reflash the ECU to reset it to the factory setting to undo whatever the previous owner did (maybe he consistently used crappy fuel so the car was compensating).
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post #28 of 30 Old 01-07-2014, 08:34 PM
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Quote:
Originally Posted by Tideland Prius View Post
Other things you could check include wheel alignment and maybe flushing out the fuel lines and spark plugs with fuel injector cleaner (just grab a bottle or two from the dealer and put it into a full tank and the other 2 tanks later).

38mpg to me is terrible considering that's what I get if when it's -30C or colder (All it takes is one or two days at those temps or colder and my tank average is a goner). My worst tank was 37mpg calculated and that's when it hit -46C at the airport (-35C in and around the city).

44mpg seems ok if you're not babying it and driving it like a regular car (so no consideration for heat or A/C consumption cause reducing the need for a toasty or ice cold interior will help increase fuel economy).


You should be around 47mpg at 70mph (give or take) and highway mileage smooths out the inconsistencies since you're at a steady speed and hopefully in reasonably flat terrain with minimal head or tail wind to mess up the calculation.

Have you tried a different station or different fuel company (you'll have to try it over several tanks to get an average).

Worse come to worse, you could reflash the ECU to reset it to the factory setting to undo whatever the previous owner did (maybe he consistently used crappy fuel so the car was compensating).
I live in Eastern Tennessee, so weather extremes (other than the last 2 days!) are really rare. around 25 to 35 for lows in the winter, with winter highs in the 40's and 50's. Summertime highs are rarely above 90.

I have run fuel injector cleaner through it a couple of times, but I have not had an alignment done. I also haven't even checked the plugs - gotta put that on the to do list....

Terrain here is decidedly not flat, but it should basically even out - after all, the hills we go up one way are downhill coming back. That being said, we don't drive into the mountains much, so the hills I'm referring to are just a few hundred feet high.

Thanks for the suggestions!
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post #29 of 30 Old 01-08-2014, 07:18 PM
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No prob!

Actually rolling hills are best for mpg as you can take advantage of the descents to make it partially up the other side rather than just gliding (no arrows to/from the battery) on a flat area where eventually you'll slow down.
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post #30 of 30 Old 03-20-2014, 08:44 AM
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It's the combo of cold temps, winter fuel and other disinterested third parties. I, too, see a drastic drop in fuel mileage every winter. Plus, the engine runs more to keep the oxygen/fuel ratio sensor hot and happy (no signal until warm, even with a heated sensor).
Don't worry, your mileage will magically return when the air temp rises. It does for me every year. And this winter has been very hard on every thing .


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