Better gas mileage?? - Page 2 - Ford Mustang Forum
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Xterminator's Avatar
Joined: Nov 2010
Location: Denver
Posts: 182
Yea I have the same problem. I don't even punch it too much and I try to drive conservitavely and even stay in like 4th gear in the city to keep the RPMs low. But I still get like 17mpg... I have a manual, but I definitely should be getting at least 20mpg right?

I also have a CAI, Tuner, new plugs/wires, and dual exhaust. Would any of that contribute to in a bad way?

Thanks! And I hope you get your problem fixed jstafford

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UnexplodedCow's Avatar
Joined: May 2011
Location: Cross Lanes
Posts: 73
My personal best for the '07 4.0 5spd I call mine is 34.9 mpg (I took a picture). It was 35.0 but dropped after a couple seconds of hitting a light. It was about 58 miles of highway driving after filling up. I live in WV, and we have a few hills.

In town where I live the traffic can get a bit congested; minimum of 15 minutes to go 2 miles, and often 30 minutes when the day ends. So it's a LOT of sitting in neutral, and I can get about 17-18.

On the highway; I get up to speed slowly, let the car lose a touch of speed going up the hill (say from 70 to 65). I also run 36 psi in my tires since the car feels way too mushy with the stock 32 psi (Uniroyal tigerpaw GTZ the car came with from the dealer :-/ ) I accelerate more on the downhills, and if I'm already up to speed, will neutral coast. On extremely steep grades known to be speed traps I just keep it in 5th and coast. With everyday driving, I can net 31 mpg pretty normally. Right now I seem to be getting about 28 mpg recently with no change in driving habits, except the car went for a flywheel TSB to the dealer, and came back dirty with a chunked up wheel. Mileage has been pretty bad (from what I had) since. Currently it's sitting at 28.4 with 95% highway.

The easiest way for me to keep things in check is to use the "instant" mileage graph in my cluster (have the 6 gauge due to PP and interior upgrade). With this method I can see how far I'm putting my foot into things based on how few bars I see. The goal is to keep all 7 showing. Prior to dealer, almost any hill would show 4 bars going up, 3 on in town acceleration. Post dealer drops to 3 bars on highway hills, and 2 in town. I'm going to look into things and see wth they did beyond damaging a wheel.

Just thought I'd post a little of my experiences here. The car is totally stock. Oh, and the economy car I have ('90 Escort) had previously gotten 42 mpg on the highway at a steady 75 mph. It's due for a rebuild, and I'm working on improving that. I had a tempo years ago I could repeatedly get 51+ mpg out of on the highway.

It really, really depends on how one drives. Cruise, to me, is not a good idea for gas mileage unless on very flat land. If hills are involved, use the foot. I drive 99% of my time with my foot only.

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txdevildog's Avatar
Joined: Jul 2011
Location: Houston
Posts: 55
I could only net above 20 on the highway, my personal best is 33 when I was going 65. In the city though I guess I just drive it too fast :smilie

2006 Mustang GT
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post #19 of 19 (permalink) Old 09-21-2011 Thread Starter
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Joined: May 2011
Location: Hebron
Posts: 1,614
Well I've not been a lead foot with it, but still getting around 17mpg. Cleaned the throttle body and MAF today. The TB was dirty to say the least, so will see if that helps more.

Am saving for the JLT CAI and SCT tuner combo from AM, so just biding my time really. Its not horrible gas mileage as I only drive 5 miles each way to work.

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