3.7 Owner's MPG Report

[zackmd1]

31.8 @ 75 mph is pretty good. Did you have a tail wind? One day I was curious about the mpg difference between speeds and tested it out on a very flat road in the desert. I literally went 50 miles w/o touching the brake or changing lanes w/ cruise set at 75. I started the test once the car was up to speed. I'd have driven further than 50 miles, but I noticed no change in the mpg between 40 and 50 miles and I wasn't headed anywhere. I know 50 miles probably isn't enough miles to give a definitive number. 800 miles, however, could be more accurate if you were at cruise speed the whole time, w/o dipping to slower speeds. Did you do any dipping of speed?

I would say 80 miles spread out over the 800 could have been a slower speed around 65-70mph. I was at 32.1 before we stopped for some food/gas. This was also with a few spirited blips to keep me awake! Also with 2 passengers and luggage.

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[Bay1Stang]

Took the hour drive to my dealer and for 28.5. That's with getting off and on alot of roads and congestion. I can see it easily getting 30 while cruising.

Edit: 3.55

 

[davekro]

Personally, short mileage reported by the computer don't seem very accurate, so don't really tell me much. What I will be curious of when I get my V6 is calculated MPGs over several tanks of gas. That reflects what I am actually getting, not what I could get if or when I am driving a certain speed or distance. But the 800 mile trip was very good info for that scenario! )

 

[zackmd1]

Personally, short mileage reported by the computer don't seem very accurate, so don't really tell me much. What I will be curious of when I get my V6 is calculated MPGs over several tanks of gas. That reflects what I am actually getting, not what I could get if or when I am driving a certain speed or distance. But the 800 mile trip was very good info for that scenario! )

Did a hand calculation this morning for the trip! Computer read 31.8 and my calculation came out to 31.2!

 

[DJGold]

I usually average 22 mpg with 80% city driving.

I second this ^^^

 

[davekro]

I second this ^^^

This sounds good. My current car averages 22 miles per gallon (2000 2.5L V6 Chrysler convertible). I was hoping this one got 25 to 26 miles per gallon with the same 60% freeway 40% city driving that I do. sounds like that might be possible.

 

[AUBStang]

Currently around 24 with my commute interstate and city. Probably 80/20

 

[ajfrench]

Set trip 2 odometer to zero a few weeks ago and never reset it. It is now at 1950 miles and the calculated MPG is 24.5. This is 60% city, outskirts of the city, and rural, and 40% interstate. Now today I was on the interstate for about 100 miles from Columbia SC to Summerville, SC. Some moderate uphills and downhills. Was able to get 31.4 MPG driving between 68-71 MPH. MPG went higher below 68 and lower above 71. V6 Auto, 3.15 gears, and Magnaflow mufflers, that's it!

 

[johnkeel105]

I think it really is a testament to the design of this car that it is able to get 28-30mpg highway and have so much power. I think it may be possible to eek more gas mileage out of this car then my 02' Ford Focus, even with 3.55 gearing.

 

[Jason_W]

Set trip 2 odometer to zero a few weeks ago and never reset it. It is now at 1950 miles and the calculated MPG is 24.5. This is 60% city, outskirts of the city, and rural, and 40% interstate. Now today I was on the interstate for about 100 miles from Columbia SC to Summerville, SC. Some moderate uphills and downhills. Was able to get 31.4 MPG driving between 68-71 MPH. MPG went higher below 68 and lower above 71. V6 Auto, 3.15 gears, and Magnaflow mufflers, that's it!

Not to derail this thread...but do you have any sound/video clips of your v6 with the magnaflows?

 

[ajfrench]

Not to derail this thread...but do you have any sound/video clips of your v6 with the magnaflows?

I have a short video under "2015 Mustang Magnaflow difference 11365.....

 

[ColdShotxx]

Is anyone seeing an improvement in mpg with higher octane than the 87 the manual says to use?

 

[zackmd1]

Is anyone seeing an improvement in mpg with higher octane than the 87 the manual says to use?

I have run 93 a few times to see if there is a difference. You might see a 1 mpg improvement. To me the difference 93 gives is hardly worth the premium price per gallon and the difficulty of finding it where I live.

 

[zackmd1]

So I calculated my return trip mpg. I took the more "scenic" route home through Georgia while visiting family along the way. 1200 miles with more hills, stoplights, and a lower average speed. Average mpg was 30.4 calculated by hand.

 

[ColdShotxx]

Has anyone found the 'optimal' rpm to maximize fuel economy? Im feeling its somewhere in the 1700-1900 range .

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