G37 Sedan

bad gas mileage 200 miles a tank

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Old 05-07-2012, 12:23 PM
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kdawg8526
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i usually warm up the car for few mins i wait till the temp gauge moves to the middle maybe that can cause it?
Old 05-07-2012, 12:44 PM
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Sunny G
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My car is lowered on 20s and I get about 16.5 city and 21 hwy. When I drive on the highway I cruise in 6th gear (6MT) at 65 MPG which puts me close to 2k rpm. Maybe try cleaning out the fuel injectors maybe that would help
Old 05-07-2012, 12:57 PM
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trcb777
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2011 7A sedan on 19". I average 23 city(Atlanta)/highway. 28~29 highway only with ac and cruise and loaded up.
Old 05-07-2012, 12:59 PM
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autodoof
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Originally Posted by kdawg8526
i usually warm up the car for few mins i wait till the temp gauge moves to the middle maybe that can cause it?
That sure doesn’t help. You’re getting 0 mpg during that time. Just warm until the RPMs drop toward 1k, about 30 seconds. This is when the computer knows the fuel mixture is good to go.
Old 05-07-2012, 12:59 PM
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marley702
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I didn't see this mentioned but, make sure you're running premium fuel (91 octane). These cars do poorly on regular unleaded (87 octane).
Old 05-07-2012, 01:01 PM
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canucklehead
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Originally Posted by kdawg8526
i usually warm up the car for few mins i wait till the temp gauge moves to the middle maybe that can cause it?
hmm, that certainly won't help. but i doubt it's the cause of 200mi range. unless you are waiting for ice/frost to clear off the windows, you should only need to idle the car for at most 30 seconds - or until the idle drops down to 1000-1200rpm. that's plenty of time to allow oil to circulate. just drive the car gently until everything (engine, tranny, gears, etc) warms up to operating temp, usually after a few minutes of constant driving.

try reducing your "warmup" idle time and see if that helps, but i suspect you have other fuel issues as well if you're only getting 200mi. running rich?
Old 05-07-2012, 01:02 PM
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kdawg8526
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Originally Posted by marley702
I didn't see this mentioned but, make sure you're running premium fuel (91 octane). These cars do poorly on regular unleaded (87 octane).
i always run 92 or higher
Old 05-07-2012, 03:23 PM
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Austin713
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Originally Posted by kdawg8526
i usually warm up the car for few mins i wait till the temp gauge moves to the middle maybe that can cause it?
idling has alot to do with it. i usually let all my stuff turn on phone connect and then go. no more than 30 sec.

also with 70% city driving and a heavier foot youre lucky to get above 16. ive got the 5AT and i do about the same driving and im hovering around 16.5
Old 05-07-2012, 04:40 PM
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blackhawksfan81
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Originally Posted by kdawg8526
i usually warm up the car for few mins i wait till the temp gauge moves to the middle maybe that can cause it?
Definitely try to avoid that unless you can't help it (in the winter, etc).
Old 05-07-2012, 04:49 PM
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Chekov
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I would consider myself a conservative driver but for city driving I average no better than 15.5mpg, but for highway use it jumps to 25mpg. The best I ever did on a long trip was 27mpg.
Old 05-07-2012, 05:11 PM
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Dj1ofDet
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That's weird you only get 200 miles per tank. I get 300 miles per tank, or approximately 18.8 MPG with all city driving.
Old 05-07-2012, 11:03 PM
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BKG37X
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Some interesting figures here, I get 15.2 mpg (90% NYC traffic) after an Uprev tune on the "economy map", a bit better than what I got when I was stock (14 mpg from what I remember).
Old 05-07-2012, 11:19 PM
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Dj1ofDet
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Originally Posted by BKG37X
Some interesting figures here, I get 15.2 mpg (90% NYC traffic) after an Uprev tune on the "economy map", a bit better than what I got when I was stock (14 mpg from what I remember).
That's crazy! I thought the DMV was voted the worst traffic in the nation? Where's all your fuel going?
Old 05-08-2012, 08:04 AM
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jmueller
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I was averaging about 17mpg through 80% city. If you have a heavy foot, and you idle the car for 4 minutes every morning (prob about how long it takes to get the gauge to the middle) averaging 16mpg is about accurate.
Old 05-08-2012, 08:33 AM
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Coprolite
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Idling will eat mpg for breakfast. You never mentioned terrain or lengths of trips. If you idle for 2-4 minutes and then drive 15, it is easy to see the drop. I live in a hilly area and most of my trips are only 10-15 minutes from start to stop(including the few seconds to minute for the catalytic idle, most of the time).

I have found my local average is skewed towards the city rating on all my cars. When I have combined tanks that include trips to Houston, I can get right around highway rating.

I might have missed it, but how many gallons do you add at each fill? Running it to the fill light will produce 17-18 gallons of space. 0 miles on range is calibrated to abbot 18.


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