Huge decrease in fuel economy. Help.
Thread Starter
AudiWorld Senior Member
Joined: Dec 2005
Posts: 1,018
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Huge decrease in fuel economy. Help.
Drove the car some more today and last night, a total of about 68 miles...
There is a huggge decrease in mileage. I have no idea when this started, I typically just put whatever money I have in my pocket in the car, I wait for gas to go down before I fill up... Since I've been chipped, I haven't really filled up. Last night after I filled up all the way I noticed I was getting an average of 16mpg, and thats without flooring it for 68 miles...
When you put 10 dollars in here and there, you really don't think about economy... but now that I've seen how bad it has been, I'm shocked.
I KNOW that the car wasn't like this a few weeks ago...
My only mods are the GIAC 91 chip, and an MBC cranked to like 18lbs. (nothing extreme)
Something clearly isn't right.
What things should I check?
There is a huggge decrease in mileage. I have no idea when this started, I typically just put whatever money I have in my pocket in the car, I wait for gas to go down before I fill up... Since I've been chipped, I haven't really filled up. Last night after I filled up all the way I noticed I was getting an average of 16mpg, and thats without flooring it for 68 miles...
When you put 10 dollars in here and there, you really don't think about economy... but now that I've seen how bad it has been, I'm shocked.
I KNOW that the car wasn't like this a few weeks ago...
My only mods are the GIAC 91 chip, and an MBC cranked to like 18lbs. (nothing extreme)
Something clearly isn't right.
What things should I check?
AudiWorld Senior Member
Joined: Jan 2006
Posts: 1,108
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Could be anything...>>>
Chip.
MAF.
O2 Sensors.
Running rich (VAG com for that code).
Tire pressures.
More City driving.
Traffic jams.
MBC cranked to 18lbs.
Brakes dragging.
Type of shoes you wear affecting pressure on throttle pedal.
Etc.
MAF.
O2 Sensors.
Running rich (VAG com for that code).
Tire pressures.
More City driving.
Traffic jams.
MBC cranked to 18lbs.
Brakes dragging.
Type of shoes you wear affecting pressure on throttle pedal.
Etc.
AudiWorld Super User
Joined: Apr 2004
Posts: 4,773
Likes: 302
Before you panic----- colder weather?????
Cold starts and warm ups are very detrimental to milage on short runs.( It takes energy to get all that stuff up to operating temp. ) With the car fully warmed up. (30 minutes of driving) On level freeway at approx 70 mph on cruise control ----- reset the avg mpg then let it run for a few miles. Watch for uphills and downhills, they make a big difference. It should be 28 mpg or better. If not then somethings off.
My APR program seems to affect milage more when it's cold (1 to 2 mpg) Hard to be sure but it does seem to. Every time I put it in stock mode to check --- I get fed up with the lack of power and switch back to the chipped program in a few miles.
My APR program seems to affect milage more when it's cold (1 to 2 mpg) Hard to be sure but it does seem to. Every time I put it in stock mode to check --- I get fed up with the lack of power and switch back to the chipped program in a few miles.
Thread Starter
AudiWorld Senior Member
Joined: Dec 2005
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Running rich...
Would just be caused by the combination of those issues...
I guess I'll check out vag com and see what it has to say...
I'm guessing its the MAF or something, it doesn't seem to be running really rich, my exhaust tips are somewhat sooty, but its not really out of the ordinary.
Hopefully I can get this figured out. I can settle with 22mpg average, because I do have a heavy foot and I do a lot of city driving... but this 15-16mpg is not going to cut it.
I guess I'll check out vag com and see what it has to say...
I'm guessing its the MAF or something, it doesn't seem to be running really rich, my exhaust tips are somewhat sooty, but its not really out of the ordinary.
Hopefully I can get this figured out. I can settle with 22mpg average, because I do have a heavy foot and I do a lot of city driving... but this 15-16mpg is not going to cut it.
AudiWorld Super User
Joined: Aug 2006
Posts: 3,248
Likes: 1
Speaking of decreased fuel economy...
<center><img src="http://pictureposter.audiworld.com/113335/excited_guy.jpg"></center><p>I noticed it once I chipped mine, I started driving more aggressive. I also like to hear the sound of my Borla... and the VTDA... it's so FUN! ;-D Woooohoooo!!!
Fun till I get a speeding ticket :-o
...or two :-O
...or three! :-/
HEY guys!!! it's all your fault!!! I'm hooked! Stop talking about this stuff already... and I'll stop modding... and have $$$$$$ again!
AND... no more fun :-(
Thanks for giving me a new "life"!
Fun till I get a speeding ticket :-o
...or two :-O
...or three! :-/
HEY guys!!! it's all your fault!!! I'm hooked! Stop talking about this stuff already... and I'll stop modding... and have $$$$$$ again!
AND... no more fun :-(
Thanks for giving me a new "life"!
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Senior Member
Joined: May 2004
Posts: 5,329
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well...
could be a number of things as others have mentioned. Cold weather will make a big difference as the car will run really rich until it gets up to temp. So short drives will drastically reduce milage. You could have a sensor going, but I wouldn't worry about it until you notice your mileage being consistantly lower over several tanks with mixed driving.
I noticed consistant declining fuel milage with my TT. It was averaging 20 mpg when it usually was around 24. I hadn't gotten around to checking the sensor outputs or anything else. Then following a week out of town my battery was dead when I returned to the airport garage. I knew it had been on its way out. Well anyway, when I replaced the battery I noticed better throttle response. Thought it was just in my head, but then the milage instantly returned to normal. That's the first time I've experienced anything like that.
I noticed consistant declining fuel milage with my TT. It was averaging 20 mpg when it usually was around 24. I hadn't gotten around to checking the sensor outputs or anything else. Then following a week out of town my battery was dead when I returned to the airport garage. I knew it had been on its way out. Well anyway, when I replaced the battery I noticed better throttle response. Thought it was just in my head, but then the milage instantly returned to normal. That's the first time I've experienced anything like that.