Wow... Mpg win

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03-08-2011, 09:46 PM

#21

Nuke

6th Gear Member

Join Date: Jun 2007

Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)

Posts: 16,182

There are a lot of variables. But I'd change gas stations since the percentage of ethanol can have a huge impact on fuel mileage. Be sure your tires are inflated properly (I usually run about 1-3 PSI over the door placard). Also, fuel mileage should improve a bit as the engine breaks in. Driving style is another big factor.
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Your oil change will be wayyyyy too early and I'll guarantee that it won't help (unless the factory really screwed up)

03-08-2011, 10:06 PM

#22

Joenpb

2nd Gear Member

Join Date: Jan 2011

Location: San Diego, CA

Posts: 263

Quote:

Originally Posted by grayfox89

Hey guys, im getting a little worried hearing about how good of mileage you guys are getting. I have a v6 manual 2011 mustang with 2.73 gears, all stock and im only getting 17 mpg while driving 40 percent highway and 60 percent city. I baby the gas pedal and get great mileage out of other manual vehicles, but I just cant get my mustang to do any better. I use 87 octane and reset the computer every time i fill up to see if there is any improvement. I only have 1700 on the odometer thus far. I have yet to change the oil so Im gonna do that tommorow and check the filters, but other than that i dont know why my mpgs are so ****ty. Any ideas?

That's about right considering you drive in town more than the highway were 6th gear for the 3.7L provides the best results.

From the manual:

Quote:

Measuring techniques
Your best source of information about actual fuel economy is you, the
driver. You must gather information as accurately and consistently as
possible. Fuel expense, frequency of fill-ups or fuel gauge readings are
NOT accurate as a measure of fuel economy. We do not recommend
taking fuel economy measurements during the first 1,000 miles
(1,600 km) of driving (engine break-in period). You will get a more
accurate measurement after 2,000 miles–3,000 miles (3,000 km–5,000
km).

I'd dive it a bit more, then take a nice road trip. Fill up the tank before, then fill it again to see how much fuel was used. Divide how many miles were driven by the number of gallons used for your MPG. My guess is if you keep your speed around 70 mph you'll average > 25 mpg.

03-09-2011, 04:32 AM

#23

6+6 Stang

5th Gear Member

Join Date: Oct 2009

Location: Livin in NC, from Michigan...Yooper

Posts: 2,008

edit...not sure what happen, double post..sorry see below

Last edited by 6+6 Stang; 03-09-2011 at 04:36 AM.

03-09-2011, 04:35 AM

#24

6+6 Stang

5th Gear Member

Join Date: Oct 2009

Location: Livin in NC, from Michigan...Yooper

Posts: 2,008

You know said this before last yes when I had a '10 w/ 3.73 6 spd manual.....and it has carried over to my '11 6'er 3.31's in my 6.....when driving say 55 to 60 on highway...6th gear, I'll come to little hoop dee do's in the road..you know slight grades, suttle grades...you see mpg's go up and down...but if not paying attention..I drop to 4th and 5th gear...step on it alittle with rpm's...I notice it actually likes living in that higher rev area..the mpg's get better or stay same and don't go up and down like when I hold it steady...just funny I found...the racier I kick it does hurt actually..just an observation.