I own a 92 Celica GT. 5s-fe. We bought it at 175,000kms and it now has 278,000kms. We have always ran Premium fuel. The performance increase is great and the engine simply runs smoother.
But lately, as fuel prices have risen to stupid levels, I decided to run Regular fuel. I noticed right away that the gas gauge wasn't going down as quickly. So I monitored my mileage for around a month now.
My mileage is around 35 - 37 mpg on Regular fuel. I can now get around 700kms per tank....Wow! And this a variety of driving conditions. Half hwy and half city driving.
On Premium, I'd get around 600kms per tank and the mileage was around 32-33mpgs. Same driving conditions.
How come this doesn't make much sense to me?
Any theories out there as to why I get better fuel milage with Regular than Premium? Anyone else noticed this with their 5s-fe?
with higher octane fuel you have more additives to prevent pre-detonation (knocking) which decreases its ability to preserve itself for longer periods of time. with regular octane you have less additives allowing the fuel to be more efficient.
My mileage is around 35 - 37 mpg on Regular fuel. I can now get around 700kms per tank....Wow! And this a variety of driving conditions. Half hwy and half city driving.
On Premium, I'd get around 600kms per tank and the mileage was around 32-33mpgs. Same driving conditions.
Not saying you're lying, but ..... I'm calling BS on 35-37mpg on a half hwy/half city driven 5S-FE equipped Celica. Unless this car has been stripped of any extraneous weight (pwr strng, ac, insulation, sound system, spare tire, jack, tools, etc) , I don't ever see it happening, no matter what fuel you're running (not including gravity, but....that only works one way ) FWIW, I'd love to be proved wrong, but don't expect it, especially over the www.................................... (not to mention that higher octane fuel doesn't improve performance in an engine designed to run on regular unleaded )
with higher octane fuel you have more additives to prevent pre-detonation (knocking) which decreases its ability to preserve itself for longer periods of time. with regular octane you have less additives allowing the fuel to be more efficient.
High octane is not an additive. Its the fuel itself. High octane = longer fuel molecule = takes longer to burn = less detonation.
Since the first half of your statement is BS, the second half .....
I drive my 92 5S-FE around 800kms per week (500 miles) depending on where my work takes me. It's my business car. Believe me, the car is much quicker off the line and up hills on Premium fuel than Regular. It idles noticably smoother and quieter as well.
I can't say much about the makeup of gasoline. That's why I asked. However I can say that I get better MPG on Regular than Premium. I almost always have a clean air filter and Denso plugs.
My first few calculations were 35.4, 35.8. My recent calculations brought me up to 36.8.
The RPMs rarely go over 3200. I shift as early as I can. 110kms per hour as I can't afford the speeding tickets.
i know its not an actual additive but thats the best way i thought to explain it but if you want to get technical its the mixture of iso-octane and heptane
for example, gasoline with a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90.
To my understanding and thought on this is that if your ECU wasn't program to run higher octane it isn't worth much using it. It will provide a slight increase in performance for the difference in price it doesn't really add much if any at all. On the other hand, if your car was ment to run 91+ octane that running at a lower level octane level will dramaticly decress performance as the engine/ecu is going to adjust itself to meet the lower levels. Again this is just my thoughts.
try this i found this way works best throw out that ugly body style car and get a better one any body style below 1995 was just pure shit. ugly, ugly ugly, I wouldn't even let my grandmother drive it and well she drives a ugly car anyways.
"try this i found this way works best throw out that ugly body style car and get a better one any body style below 1995 was just pure shit. ugly, ugly ugly, I wouldn't even let my grandmother drive it and well she drives a ugly car anyways."
Well your a moron, First of all what does your post have at all to do with what the current thread was created for?!? Secondly what about the 94 model you dumbass it is a 6th generation and looks the same as the 95...
Im glad you currently like your model celica but that is your opinion and he was asking about gas mileage not your opinion on if you like his body style or not... If yo want a narrowminded opinion like that well here is mine, Your a bitch for having a celica any newer than a 5th generation... all celicas above this generation look like they were aimed for only a female populous and you i sincerely hope are female or gay.... That piss you off?? Do I care??? Do the world a favor and STFU if you arent going to be helpful then dont post and keep your narrow minded thoughtsto your ignorant self...
To the OP you should be getting better fuel economy on regular than premium or plus they are higher Octane and have a lower flash point they are mainly meant to increase peformace slightly if at all, Burn cleaner and are proven to help clean engine internals. If you really must know and are this intrigued not to be an ass but in all honestly look at wikipedia and see what it says tat might also hlp yo figure out why...
try this i found this way works best throw out that ugly body style car and get a better one any body style below 1995 was just pure shit. ugly, ugly ugly, I wouldn't even let my grandmother drive it and well she drives a ugly car anyways.
you have a 7afe you have no room to talk down on other gens
"try this i found this way works best throw out that ugly body style car and get a better one any body style below 1995 was just pure shit. ugly, ugly ugly, I wouldn't even let my grandmother drive it and well she drives a ugly car anyways."
Well your a moron, First of all what does your post have at all to do with what the current thread was created for?!? Secondly what about the 94 model you dumbass it is a 6th generation and looks the same as the 95...
Im glad you currently like your model celica but that is your opinion and he was asking about gas mileage not your opinion on if you like his body style or not... If yo want a narrowminded opinion like that well here is mine, Your a bitch for having a celica any newer than a 5th generation... all celicas above this generation look like they were aimed for only a female populous and you i sincerely hope are female or gay.... That piss you off?? Do I care??? Do the world a favor and STFU if you arent going to be helpful then dont post and keep your narrow minded thoughtsto your ignorant self...
your dumb shut th fuck up, ok so i forgot about 94 oops
I have 270,000 kms. Kilometers..... Not Miles. All my MPG calculations are just to allow the US TN members to follow along. Fortunately, it's the Metric system north of the boarder. Most up here refer to the mileage for a car as liters / 100 kilomoters. I'm around 7.5 Ltr/100km.
And I got 36.8 MPGs on my last tank. That's an average of a whole tank. Not just a few 100 kms. It is what it is. I have read in other posts both in TN and other forums that guys are getting that kind of mileage if the car is driven nicely. I mean, if you research the 5S-FE, it's not like it's full of performance. It's sort of an economy engine right out of the box. There's not much one can even do improve the performance of a 5S-FE.
It's no 3S-FE that's for sure. I prefer that motor.....
And another interesting thought. My good friend has a Scion XB. 2001 I think. It has a 1.5 Ltr motor and always ran on Premium. Now after chatting with him about my surprising fuel economy with Regular fuel the last couple weeks, he went to Regular. And wow, he gets way better MPG. He's now getting a fuel mileage that comparible to what all his Scion forum guys claim they were always getting......
Anybody wondered if maybe the composition of gasoline has changed recently? Even my old carburated 79 Toyota 4X4 is running better latley. Just a thought/observation
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Regular Fuel and Fuel Economy????
) FWIW, I'd love to be proved wrong, but don't expect it, especially over the 
)
hmmm...
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