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Old 02-10-2014, 09:06 AM   #1
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Bad gas mileage

I have a 2010 mustang v6 with NO mods except being lowered and getting around 200 miles per tank, to me this seems a little low...any help would be great on things to start checking..
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Old 02-10-2014, 10:37 AM   #2
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Gammer, how many miles are on it?

My regular list of things to do to help with gas mileage

Clean & re-oil air filter (I have Airaid CAI)
Clean Mass air flow sensor
Clean throttle body (the ethanol in gas really gums them up)
Replace fuel filter in line under car.

When I got my Mustang the TB, air filter, and MAF sensor were filthy and I was getting less than 200 miles to a tank. Cleaned all of them and now I get over 300 miles to a tank combined highway & city driving (I did the 400 miles to New Jersey on 1 tank, all highway).
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Old 02-10-2014, 10:40 AM   #3
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It has 54000 miles, air filter replaced, mas air flow cleaned but thats it so far...been so dam cold here to want to work on anything.
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Old 02-10-2014, 10:43 AM   #4
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Gammer, I know what you mean. I went to college in McPherson, Ks.

A mod that is very worth the money is buying an Airaid Cold Air Intake (don't need a tuner with it, but some come with one).

I admit that all I did for cleaning out my TB is pulled the intake tube off and sprayed ALOT in there with a can of throttle body cleaner.
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Old 02-10-2014, 10:45 AM   #5
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Will give that a try this week, I appreciate all of your information.
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Old 02-10-2014, 10:48 AM   #6
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No problem, and definitely take a look at replacing the inline fuel filter. On the 2005-2009 Mustangs its under the driver side of the car hidden by a plastic shield and it just clips in. I imagine it's probably in the same place on your 2010.
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Old 02-10-2014, 10:51 AM   #7
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dont step on it as much lol driving style has alot to do with it i have bad gas miles issues too
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Old 02-10-2014, 10:52 AM   #8
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Depending on the gas you (or previous owner(s) have used, that throttle body as 66sprint200 suggets may indeed need cleaning. Rather than spray a ton of TB cleaner into it, I'd remove it (only takes 4 bolts to remove from the intake, plus the electrical plug), then clean it over a pan.

You may need to remove the battery lead to force the PCM to "re-learn" the idle, as it may have compensated on the idle for a dirty TB.
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Old 02-10-2014, 11:33 AM   #9
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Quote:
Originally Posted by bucko View Post
Depending on the gas you (or previous owner(s) have used, that throttle body as 66sprint200 suggets may indeed need cleaning. Rather than spray a ton of TB cleaner into it, I'd remove it (only takes 4 bolts to remove from the intake, plus the electrical plug), then clean it over a pan.

You may need to remove the battery lead to force the PCM to "re-learn" the idle, as it may have compensated on the idle for a dirty TB.
I just did it my way as a temporary measure. lol When I get my throttle body spacer I'm going to take it off and give it a proper clean.
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Old 02-10-2014, 11:32 PM   #10
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These guys have definitely provided some good info. For ~$50 you can pick up a high flow air filter. My K&N in my GT got me 1-2+ MPG city and 3+ MPG highway. An aftermarket CAI without a tune may yield very similar if not the same results. A tune, CAI, and dual exhaust conversion will definitely help too. I did all of that to my old 4.0 V6. Got ab 220 miles/tank with on/off spirited driving.
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