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Discussion Starter #1
My father-in-law has a 2000 Avalon and says that the onboard computer
that calculates his gas mileage only works up till he turns off his
car. Then it resets. Every car I've seen that has an mpg calculation
on board has both instant mpg and average mpg (which you must manually
reset). Is this true that the average mpg on an avalon is reset each
time you turn off the car? If so this is a pretty worthless piece of
information.

Don
 
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Discussion Starter #2
Yes it is true for the 2000 and 2001. One of many crappy features about
that car that no one notices when reviewing it. Too bad they can't make
seatbelts that wind back up by themselves and auto climate control that
works.


"Don" <[email protected]> wrote in message
news:[email protected]
> My father-in-law has a 2000 Avalon and says that the onboard computer
> that calculates his gas mileage only works up till he turns off his
> car. Then it resets. Every car I've seen that has an mpg calculation
> on board has both instant mpg and average mpg (which you must manually
> reset). Is this true that the average mpg on an avalon is reset each
> time you turn off the car? If so this is a pretty worthless piece of
> information.
>
> Don
 
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Discussion Starter #3
I have a 2000 Avalon but it does not have the feature. I also have a
03' 4-runner that does.... The reason I'm telling you this is in my
experience the mpg computer is very inaccurate. My 4 runner says I get
19.2 mpg consistently. My math at the gas pump is closer to about 16
mpg. The 16 is much closer to the mark. Tell your father in law to just
do the math... its more accurate anyway.
Darren
 
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Discussion Starter #4
I've never bothered to check but someone else posted that their Toyota
readout matched their math perfectly mileage wise. I zero the trip odometer
every fill up and a quick look at the gas pump each time indicates 20 mpg as
a rough average.


"Darren" <[email protected]> wrote in message
news:1135894841.266455.[email protected]
>I have a 2000 Avalon but it does not have the feature. I also have a
> 03' 4-runner that does.... The reason I'm telling you this is in my
> experience the mpg computer is very inaccurate. My 4 runner says I get
> 19.2 mpg consistently. My math at the gas pump is closer to about 16
> mpg. The 16 is much closer to the mark. Tell your father in law to just
> do the math... its more accurate anyway.
> Darren
>
 
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Discussion Starter #5
In article <Ntetf.327$%[email protected]>,
"Art" <[email protected]> wrote:

> I've never bothered to check but someone else posted that their Toyota
> readout matched their math perfectly mileage wise. I zero the trip odometer
> every fill up and a quick look at the gas pump each time indicates 20 mpg as
> a rough average.


I have a 2000 Avalon and I get about 24-25 mpg on the highway (I drive
fairly fast) and about 15 in town (mostly very short trips). That is on
premium fuel.


Merritt
 
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Discussion Starter #6
Darren wrote:
> I also have a 03' 4-runner that does.... The reason I'm telling you
> this is in my experience the mpg computer is very inaccurate.
> My 4 runner says I get 19.2 mpg consistently. My math at the gas pump
> is closer to about 16 mpg.


You have to zero the Toyota built-in mileage indicator every time
you fill up and calculate your mileage. Otherwise it is a
_cumulative_ mpg.
 
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Discussion Starter #7
"Merritt Mullen" <[email protected]> wrote in message
news:[email protected]
> In article <Ntetf.327$%[email protected]>,
> "Art" <[email protected]> wrote:
>
>> I've never bothered to check but someone else posted that their Toyota
>> readout matched their math perfectly mileage wise. I zero the trip
>> odometer
>> every fill up and a quick look at the gas pump each time indicates 20 mpg
>> as
>> a rough average.

>
> I have a 2000 Avalon and I get about 24-25 mpg on the highway (I drive
> fairly fast) and about 15 in town (mostly very short trips). That is on
> premium fuel.
>
>

I have a 2000 Avalon. I get 20 MPG city and 30 MPG highway.
I have never used anything but regular gas. The average MPG
calculator on mine is exactly correct. I checked it on 5 different
gas tank fills. It is too bad that it resets on every trip, but it is
useful on telling how you did on that trip.
 
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Discussion Starter #8
"sam" <[email protected]> wrote:

>
>"Merritt Mullen" <[email protected]> wrote in message
>news:[email protected]
>> In article <Ntetf.327$%[email protected]>,
>> "Art" <[email protected]> wrote:
>>
>>> I've never bothered to check but someone else posted that their Toyota
>>> readout matched their math perfectly mileage wise. I zero the trip
>>> odometer
>>> every fill up and a quick look at the gas pump each time indicates 20 mpg
>>> as
>>> a rough average.

>>
>> I have a 2000 Avalon and I get about 24-25 mpg on the highway (I drive
>> fairly fast) and about 15 in town (mostly very short trips). That is on
>> premium fuel.
>>
>>

>I have a 2000 Avalon. I get 20 MPG city and 30 MPG highway.
>I have never used anything but regular gas. The average MPG
>calculator on mine is exactly correct. I checked it on 5 different
>gas tank fills. It is too bad that it resets on every trip, but it is
>useful on telling how you did on that trip.
>

Sam...what does the owner's manual call for in fuel?...
--

-Gord.
(use gordon in email)
 
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Discussion Starter #9
"Gord Beaman" <[email protected]> wrote in message
news:[email protected]
> "sam" <[email protected]> wrote:
>
>>
>>"Merritt Mullen" <[email protected]> wrote in message
>>news:[email protected]
>>> In article <Ntetf.327$%[email protected]>,
>>> "Art" <[email protected]> wrote:
>>>
>>>> I've never bothered to check but someone else posted that their Toyota
>>>> readout matched their math perfectly mileage wise. I zero the trip
>>>> odometer
>>>> every fill up and a quick look at the gas pump each time indicates 20
>>>> mpg
>>>> as
>>>> a rough average.
>>>
>>> I have a 2000 Avalon and I get about 24-25 mpg on the highway (I drive
>>> fairly fast) and about 15 in town (mostly very short trips). That is on
>>> premium fuel.
>>>
>>>

>>I have a 2000 Avalon. I get 20 MPG city and 30 MPG highway.
>>I have never used anything but regular gas. The average MPG
>>calculator on mine is exactly correct. I checked it on 5 different
>>gas tank fills. It is too bad that it resets on every trip, but it is
>>useful on telling how you did on that trip.
>>

> Sam...what does the owner's manual call for in fuel?...
> --
>
> -Gord.
> (use gordon in email)


87 octane unleaded.
 
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Discussion Starter #10
"sam" <[email protected]> wrote:

snip

>> Sam...what does the owner's manual call for in fuel?...
>> --
>>
>> -Gord.


>
>87 octane unleaded.
>


Yes, OK...so Merritt is wasting money by using premium then...
--

-Gord.
(use gordon in email)
 
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Discussion Starter #11
In article <[email protected]>,
Gord Beaman <[email protected]> wrote:

> "sam" <[email protected]> wrote:
>
> snip
>
> >> Sam...what does the owner's manual call for in fuel?...
> >> --
> >>
> >> -Gord.

>
> >
> >87 octane unleaded.
> >

>
> Yes, OK...so Merritt is wasting money by using premium then...


That is not exactly what the owner's manual says.

What the owners manual actually says is to use 91 octane for best
performance, but the minimum acceptable is 87 octane. If you use the 87
octane (regular) the timing will be automatically retarded by the knock
sensor (as necessary) to prevent detonation (pinging, knocking), and
mileage will be slightly worse (less cylinder pressure, less efficiency).
But that only comes into play when the engine is working hard, such as
climbing a steep grade or under heavy acceleration. Since the price
difference is less than 10% (20 cents) between premium and regular, I
choose to use premium so it is there when I need it (when you are retired,
money is no object--grin).

I know about octane ratings and what they do as I am a retired Naval
Aviator and I used to teach aircraft powerplants. Aircraft reciprocating
engines are very sensitive to the proper octane fuel. AvGas comes in
different colors so you know for sure what octane you are getting.

Merritt
 
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Discussion Starter #12
"Merritt Mullen" <[email protected]> wrote in message
news:[email protected]
> In article <[email protected]>,
> Gord Beaman <[email protected]> wrote:
>
>> "sam" <[email protected]> wrote:
>>
>> snip
>>
>> >> Sam...what does the owner's manual call for in fuel?...
>> >> --
>> >>
>> >> -Gord.

>>
>> >
>> >87 octane unleaded.
>> >

>>
>> Yes, OK...so Merritt is wasting money by using premium then...

>
> That is not exactly what the owner's manual says.
>
> What the owners manual actually says is to use 91 octane for best
> performance, but the minimum acceptable is 87 octane. If you use the 87
> octane (regular) the timing will be automatically retarded by the knock
> sensor (as necessary) to prevent detonation (pinging, knocking), and
> mileage will be slightly worse (less cylinder pressure, less efficiency).
> But that only comes into play when the engine is working hard, such as
> climbing a steep grade or under heavy acceleration. Since the price
> difference is less than 10% (20 cents) between premium and regular, I
> choose to use premium so it is there when I need it (when you are retired,
> money is no object--grin).
>
> I know about octane ratings and what they do as I am a retired Naval
> Aviator and I used to teach aircraft powerplants. Aircraft reciprocating
> engines are very sensitive to the proper octane fuel. AvGas comes in
> different colors so you know for sure what octane you are getting.
>
> Merritt


Your quote is not exact. On page 192 the manual says:
"Select Octane rating 87 or higher. For improved vehicle performance
the use of premium unleaded gasoline with octane rating of 91 or higher
is recommended."

The manual calls for 87. It says you can use higher. What car
is this not true for?

Than to paraphrase it says using less than 87 will cause knocking.
The manual does not say any of the other things that you mention.
The manual does not suggest what the improved performance
might be.

I interrupt the manual to say that 87 is fine. I have driven
the car 100,000 miles and have never felt a need for any
more performance. This has included to pretty tall and
steep mountains up to 14,000 feet. I consistently get
20 MPG city and 30 MPG highway. On one tank of
regular gas I actually got 40 MPG. The circumstance
for that was following my son who was driving an
overloaded UHaul truck.

Once I accidentally did fill with premium and noticed
no difference.

So I am open minded what performance improvement
can I expect to see? What sort of gas mileage can I
expect to see? I am a retired engineer for the past
13 years so the needless extra expense of $.20 per
gallon is a factor. The oil company profits are
high enough.

From my engineering education I seem to remember
that higher octane gas contains fewer BTU per gallon
and unless the engine is designed to need the higher
octane the result will be poorer gas economy.
 
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Discussion Starter #13
Merritt Mullen <[email protected]> wrote:
snip
>
>I know about octane ratings and what they do as I am a retired Naval
>Aviator and I used to teach aircraft powerplants. Aircraft reciprocating
>engines are very sensitive to the proper octane fuel. AvGas comes in
>different colors so you know for sure what octane you are getting.
>
>Merritt


Excellent post Merritt...after I had released that post I was a
bit concerned that it might have been too abrupt, I'm glad that
you didn't take offense at it.

What you say is exactly right, I, too taught aircraft recips to
students after spending many years operating them as a Flight
Engineer.

My last stint was 7 years as an Argus F/E, big momma recips,
115/145 octane (purple fuel as you know!)
--

-Gord.
(use gordon in email)
 
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