MODS that increase MPG??
Melting Slicks
Joined: Aug 2000
Posts: 2,900
Likes: 2
From: Green Cove Springs FL
Perhaps have a compression test done on your engine. I had a Ford Probe once upon a time that had a bad head gasket and the MPG kept getting less and less. I sold it when it was getting 22mpg on the highway, then the new owner replaced the head gasket, and it got 30mpg after that.
Do you have white or black smoke coming from the exhaust? The smoke would be most noticeable when you accelerate.
Do you have white or black smoke coming from the exhaust? The smoke would be most noticeable when you accelerate.
Drifting
Joined: Apr 2007
Posts: 1,517
Likes: 159
From: Lafayette Louisiana
My '04 CE A4 gets 26 - 27 on the freeway. I installed K&N filter a while back, that seemed to increase milage from 25 - 26 to where it is now. Don't know if was K&N or just time to change the filter.
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
I have an A4 with 3.15 gears and on the highway with cc set I get about 28-29 mpg, In town I get about 19-20. That is figuring it with gals used and miles driven on a 450 mile trip.
Racer
Joined: Sep 2009
Posts: 410
Likes: 1
From: In Central TX
Here's a link to a trip we took in our stock '04, A4, 3.15 rear end Cpe. Included 80 mph speed on I-10, blasting over 100mph at one point and tooling around the Rio Grande river and the town of Fredericksburg, Texas on the way home. I was happy with the mileage.
http://forums.corvetteforum.com/c5-g...road-trip.html
http://forums.corvetteforum.com/c5-g...road-trip.html
Le Mans Master
Joined: Feb 2007
Posts: 9,294
Likes: 1,527
From: Oviedo Florida
2024 C5 of the Year Finalist - Modified
2024 C2 of the Year Finalist - Modified
2023 C2 of the Year Finalist - Modified
2021 C2 of the Year Finalist - Modified
2016 C5 of Year Finalist
My vette has big power and I always get tremendous fuel savings.
I stopped by the local parts store and bought a Burmese Fuel
Snake; put it in the tank and my fuel mileage is great. Try it!!
I stopped by the local parts store and bought a Burmese Fuel
Snake; put it in the tank and my fuel mileage is great. Try it!!
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Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Le Mans Master
Joined: Jan 2004
Posts: 9,488
Likes: 1,743
From: Knoxville Tn
I have gotten 30 MPG on a couple of long trips with a 2000 a4 vert.
I don't creep along either.
try some experiments,
fill youu tank
reset the gauges
drive at 70 mph for 15 minutes.
note the RPM's (that'll tell you if the engine is running efficiently
Compare your mileage and RPM's to some of the claims here.
Those RPM readings will be a real clue..
I don't creep along either.
try some experiments,
fill youu tank
reset the gauges
drive at 70 mph for 15 minutes.
note the RPM's (that'll tell you if the engine is running efficiently
Compare your mileage and RPM's to some of the claims here.
Those RPM readings will be a real clue..
Drifting
Joined: Apr 2010
Posts: 1,443
Likes: 7
From: Bristol raceway area
I have found the DIC to be Completely Accurate on our car.
When i check the average miles per gallon on the DIC versus miles driven and gallons used it always ends up the Same or never more than + or - .2 difference.
When i check the average miles per gallon on the DIC versus miles driven and gallons used it always ends up the Same or never more than + or - .2 difference.
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Mine always reads more mpg than i actually got.
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
Mine too,,,it's usually about 1.5 mpg "happy"!! I think new wires and Delco Iridiums would be a wise investment regardless,,,It can't hurt,,and you would know you are good in that department for a long time in the future!!
Drifting
Joined: Apr 2010
Posts: 1,443
Likes: 7
From: Bristol raceway area
Nope and i am not the only one. I have discussed this on the C5 AND C6 forums and there are Many others who have the same results. As i said i check it on the DIC and then against miles driven and gallons used. I use the same gas station and usually the same pump so the readings are Very accurate.
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 363
From: Midland TX
I have seen the same MPG drop on my car the past couple years. I am now down to 13.5 average. I have new air cleaner, cleaned MAF and Throttle body, new Iridium Plugs with GM red wires.
Next step for me is to try replacing the front O2 sensors to see if that helps. After 10 years they are probably trashed (but no codes).
Next step for me is to try replacing the front O2 sensors to see if that helps. After 10 years they are probably trashed (but no codes).
