99 mustang gt better mpg ?? - Ford Mustang Forum
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post #1 of 8 (permalink) Old 05-17-2012 Thread Starter
martymar1082's Avatar
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Location: polk city
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99 mustang gt better mpg ??

I've got a 99 gt auto. Just wondering how to get better mpg out of it now it's around 17mpg all stock. I know if I drop the cats and put a cai on that will help but is there anything else? I mean I'm sure a programmer could help as well but is it all really worth doing? Do y'all think all this could get me around 25mpg or is that too much to want lol and yes I'm getting 17 keeping my foot of it and doing the speed limt. Is this normal mpg? That's also Intown highways around 21. Thanks guys

93 foxy gt, forged bottomend. Tfs h/c/rr. longtubes. vic jr airgap holley dp 750. Udp's and more...
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post #2 of 8 (permalink) Old 05-17-2012
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it's about all you can expect, the only sure fire thing that works everytime is to drive slower

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post #3 of 8 (permalink) Old 05-17-2012
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My V-6 auto conv. only gets 19 city/ 22 hwy. So to have your power. Your not loosing much.
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post #4 of 8 (permalink) Old 05-17-2012
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17 isn't bad for a v8. My 95 gets 24 cruising on the highway and about 17 in town...

1995 Laser Red 5.0L GT, White Conv Top, Automatic
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post #5 of 8 (permalink) Old 05-17-2012
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I get about 20 to 23 overall in my 2000 gt auto but thats mostly highway. All i have is a throttle body spacer from the previous owner and a drop in k&n filter.

"I play Russian Roulette daily, a man's sport."
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post #6 of 8 (permalink) Old 05-17-2012
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I agree with the others, 17/21 doesn't sound too far off, especially for an auto. Of course driving style will always have some effect but only you know exactly how you're driving it and if that's reasonable. How fast do you drive on the highway and what rpms is the auto doing?

2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers
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post #7 of 8 (permalink) Old 05-18-2012
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You're not doing bad at all. I get 19 city, 23 highway and I've done about everything I can think of to help. I don't think you can get to 25mpg, but you can probably boost it a bit over what you have now. Tire pressure, tune up, good synthetic oil, trans fluid, diff lube, make sure the wheel bearings are all good, etc. Driving style is usually where the biggest gains are found.

The artist formerly known as SteedaMatt.
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post #8 of 8 (permalink) Old 05-20-2012
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If the air filter is dirty replace it, Also I found out last year that a old fuel filter will kill your mpg, But it sounds like your car is right on the money so there is not to much left to do. Just drive it normal and only get on it / race it if someone is asking for a whipping. That's my rule
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