Miles per tank
Thread Starter
Instructor
Joined: May 2012
Posts: 110
Likes: 4
From: Gainesville FL
Miles per tank
I have read many threads about fuel gauge issues, using Seafoam or Techron, and cross over problems, but I think my problem may be different.
My 2003 A4 only gets 240 miles per tank. The first half goes 160 miles then the second half goes fast. With an 18 gal capacity and 17 miles per gallon, I should get around 300 miles. I have been adding Techron for many tank fills and it has not changed. No visible leaks.
Could this be a calibration issue with the gauge? Is there a tuner that adjusts for this?
My 2003 A4 only gets 240 miles per tank. The first half goes 160 miles then the second half goes fast. With an 18 gal capacity and 17 miles per gallon, I should get around 300 miles. I have been adding Techron for many tank fills and it has not changed. No visible leaks.
Could this be a calibration issue with the gauge? Is there a tuner that adjusts for this?
Drifting
Joined: Apr 2007
Posts: 1,517
Likes: 159
From: Lafayette Louisiana
I guess that depends on how and where you are driving. Any performance Mods? I have gone as far as about 425 miles on a full tank. That's Interstate driving at legalish speed. 2004 A4 no mods. I was on fumes when I got there.
Melting Slicks
Joined: Jan 2014
Posts: 2,764
Likes: 375
From: Central Florida
When it's on "E" how many gallons does it take to fill it back up that would tell you if it's a calibration/ gauge issue.
have you actually calculated your gas mileage?
I have the fuel gauge problem with mine it goes from not all the way full ( when full) to showing completely empty just passed half a tank.
I am a bit confused are you asking about the gas mileage or are you asking about the gauge accuracy.
have you actually calculated your gas mileage?
I have the fuel gauge problem with mine it goes from not all the way full ( when full) to showing completely empty just passed half a tank.
I am a bit confused are you asking about the gas mileage or are you asking about the gauge accuracy.
Last edited by Forcedvert; May 26, 2017 at 04:19 PM.
Melting Slicks
Joined: Jul 2016
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From: Los Angeles CA
Most to a tank was 619 miles on the way back from Texas when I bought it, took around 18 gallons IIRC. But, even when the low fuel light comes on it's never taken more than 15 when it's driven around town. Long drives seems different.
Le Mans Master
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Melting Slicks
Joined: Jul 2016
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From: Los Angeles CA
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Drifting
Joined: Nov 2016
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From: SF Bay Area
I have found that if there is about 2-3 gallons (1/8) left in the tank, it would go straight to empty upon starting up. Also, the second half does tend to go faster than the first half, I think half tank fills about 10-11 gallons. I'm usually able to get at least 300 miles though.
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I can average 25-27 mpg in almost every tank of gas in my A4. So that would be 400-425 miles per tank, or close to that.
Drifting
Joined: Apr 2007
Posts: 1,517
Likes: 159
From: Lafayette Louisiana
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
Overall ratio on the last gear is 1.911 for the 2.73 final drive gear on the A4, and 2.205 if you opted for 3.15. The M6 has an overall ratio of 1.71 for coupes and convertibles, and 1.9152 for the Z06. A4 ends up cruising at a higher RPM than M6.
Melting Slicks
Joined: Jul 2016
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From: Los Angeles CA
Thread Starter
Instructor
Joined: May 2012
Posts: 110
Likes: 4
From: Gainesville FL
When it's on "E" how many gallons does it take to fill it back up that would tell you if it's a calibration/ gauge issue.
have you actually calculated your gas mileage?
I have the fuel gauge problem with mine it goes from not all the way full ( when full) to showing completely empty just passed half a tank.
I am a bit confused are you asking about the gas mileage or are you asking about the gauge accuracy.
have you actually calculated your gas mileage?
I have the fuel gauge problem with mine it goes from not all the way full ( when full) to showing completely empty just passed half a tank.
I am a bit confused are you asking about the gas mileage or are you asking about the gauge accuracy.
Racer
Joined: Aug 2014
Posts: 400
Likes: 28
From: St. Paul (smokey!) MN
If the gauge in the corvette is anything like my Tahoe, it is not linear. In my Tahoe, the needle doesn't come off F for over 50 miles, after 200 miles it is at half, then that last half goes quickly, it is getting close to E after about 330. So the first half is really 2/3, the last half is 1/3. This is city driving.
Yes I know the corvette has 2 tanks, but seems like the 2nd half goes much quicker than the first too.
In any case, you should be getting more than 240 miles from a full tank(s).
When you fill up after driving 240 miles, how much are you putting in?
Yes I know the corvette has 2 tanks, but seems like the 2nd half goes much quicker than the first too.
In any case, you should be getting more than 240 miles from a full tank(s).
When you fill up after driving 240 miles, how much are you putting in?
Racer
Joined: Aug 2014
Posts: 400
Likes: 28
From: St. Paul (smokey!) MN
Do different years have different capacities? The manual for my 98 states 19.1 gallons. (Going from memory. I'm out f town now)
Racer
Joined: Aug 2014
Posts: 400
Likes: 28
From: St. Paul (smokey!) MN
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
http://www.z06vette.com/forums/f5/ho...m-works-60056/
Rather fascinating read into how the system works. Seems needlessly complicated to me.
Rather fascinating read into how the system works. Seems needlessly complicated to me.