A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

What is your GAS MPG?

 
Old 06-02-2011, 05:10 PM
  #31  
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Wow, this reminds me of the 928 forum on Re__ List. Lots of useless bickering and non-constructive criticism. I get 19.3 with mostly in town driving and 24.6 on the highway. Done the old fashioned way with a paper and pencil. If I reset the mpg avg. screen at the same time it reads within 2/10ths of a mpg. To what my paper and pencil says. Always.
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Old 06-02-2011, 05:54 PM
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Originally Posted by igotav8 View Post
Wow, this reminds me of the 928 forum on Re__ List. Lots of useless bickering and non-constructive criticism.
I truly respect your opinion (just not that other guy ), but I find it entertaining and therapeutic....sorry.
Unexpressed opinions cause peptic ulcers, heart disease and cancer...ask any health professional
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Old 06-25-2011, 09:10 AM
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A Few months back i went to Harrisonburg Va From western MA all on one full tank of gas. thats 514 Miles!! I set the Cruise control at 71 and every long up hill turned off the Cruise, so it wouldn't down shift but slow down instead. I can't remember how much gallons the a8 has but i counted if i had 20 gallons of gas it would be 25.7 MPG!! And when i got there i was shocked on the way back i got stuck in traffic for about an hour so i had to fill up 30 miles from my house!! still like it was mentioned here its not what you drive its how you drive.
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Old 06-25-2011, 10:58 AM
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Originally Posted by Pchelka01 View Post
A Few months back i went to Harrisonburg Va From western MA all on one full tank of gas. thats 514 Miles!! ....I can't remember how much gallons the a8 has but i counted if i had 20 gallons of gas it would be 25.7 MPG!!
You have a 23.7 gallon tank....if you used only 21.5 gallons of that (typical of completely empty reading on the gauge)in 514 miles, that would be 23.9 mpg...almost exactly what Audi claims for highway mileage.
The ONLY way to know for sure is to have recorded how much it took to refill it divided into the miles driven...not an estimate of tank size.
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Old 06-25-2011, 12:25 PM
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Old 06-25-2011, 03:54 PM
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Originally Posted by tozoM8 View Post
Woah...one of those S8 hybrids that runs on BS...I've heard of those
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Old 06-25-2011, 07:22 PM
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Originally Posted by silverd2 View Post
You have a 23.7 gallon tank.
oh... man come on and i thought mine was special.. now you killed it for me... jk

thanks for the info, i didn't actually think it would be that much and i was too lazy to look in my book
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Old 06-26-2011, 02:33 PM
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About 16mpg when running on LPG (propane in American) and 21MPG on "Gas" on a 1998 Audi S8 with exclusively high speed back road driving.
Both figures in US gallons. LPG is similar to E85, very high octane, smoother burning, lower calorific value and somewhat drier than gasoline. Unlike E85 however LPG burns hotter than gasoline (ie e85 is better).

Despite some claims to contrary, I would say that in my experiments with various cars (I converted them myself) and research online (look up Prius E85 test), E85 (and to a lesser degree LPG) both deliver better low end response and a noticeable torque increases on reasonably stock motors (assuming they can feed the enlarged fueling requirement). Sure economy takes a beating but thats missing the point of ethanol.

The issue with Ethanol blended fuel in the US is its blended with a low octane base stock. This is a US distribution problem. In Europe E5 (5% ethanol) is 99octane (or close to it) and E85 is 104octane (both RON). Ethanol is categorically not "highly corrosive", chemically is considerably less corrosive than gasoline. This myth is rooted in very old non-alcohol safe rubber (not an issue any more) and also the fact ethanol is hydroscopic, when improperly stored it attracts water which can introduce rust. This lead to strange things like old metal fuel tanks "corroding" through after ethanol was introduced. The corrosion in this case is primarily rust and I havent seen a metal fuel tanked car in decades.

PS: Both figures are manually calculated, not using the OBD (which is miles off). This car is also Remapped but I have no details on the mapping.

Last edited by mattsimis; 06-26-2011 at 02:38 PM.
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Old 07-02-2011, 02:35 PM
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When I recently drove from Seattle to San Francisco I got 24.3mpg Seattle to Medford, OR and 26.2 Medford to San Francisco. That's based on mileage and gas in the tank on fill-up, not the "mpg display." FYI the MPG display said 27.2. My average speed on the display was 72mph for the trip.
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Old 07-04-2011, 12:27 PM
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It will greatly depend on your commute conditions. When on the freeway and moving it's optimal once you are not too aggressive on the right pedal...


The "S" is geared differently.
An example of my last 6 months, and some real data...I have terrible commuting conditions with stop and go traffic etc...Best I have seen with easy freeway driving is 22mpg over my entire ownership...

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