Whats your gas mileage been like?
05-04-2013, 06:38 PM
#51
3rd Gear Member
Join Date: Mar 2010
Location: Clinton, Tennessee
Posts: 761
I know this is a 3.7L forum but can't help but chime in here. Lots of good points all around but the last three posts really worked for me.
One of the things that Ford did to get the "numbers" they wanted to sell the 305HP, 31MPG claim was put 2.73 gears in an 8.8" rear end, lean the snot out of the engine while running it hotter and run thinner motor oil. That's what my Ford dealer mechanic told me anyway (haven't looked it up to verify).
That said I don't really think the new 3.7 is actually THAT much more fuel efficient than the previous 4.0. Its a great engine in many ways but not really in efficiency IMO.
My 4.0 is EPA rated 28 MPG HWY with 3.31 gears and the T-5 manual. Generally if I reset the computer at home and baby it on the way to work (42 miles, 60% hwy) I can get 29-30 mpg on the way to work (60-65 MPH) and on the way home it will only drop down to around 27-28.
If I drive it normally (which includes a fair amount of heavy footwork) I can still get 24-25 quite easily and still have fun. When I had my 4.6 3v GT I could barely ever get over 20 MPG (car had 3.73s though) no matter how much I babied it or skip-shifted, but that was a damn fun engine FYI!
I would have to agree with Jim C., the computer in the car is pretty accurate. My car runs right about 1,700 RPM at 60 MPH.
Hope someone finds this helpful or interesting (4.0 perspective).
Tom
One of the things that Ford did to get the "numbers" they wanted to sell the 305HP, 31MPG claim was put 2.73 gears in an 8.8" rear end, lean the snot out of the engine while running it hotter and run thinner motor oil. That's what my Ford dealer mechanic told me anyway (haven't looked it up to verify).
That said I don't really think the new 3.7 is actually THAT much more fuel efficient than the previous 4.0. Its a great engine in many ways but not really in efficiency IMO.
My 4.0 is EPA rated 28 MPG HWY with 3.31 gears and the T-5 manual. Generally if I reset the computer at home and baby it on the way to work (42 miles, 60% hwy) I can get 29-30 mpg on the way to work (60-65 MPH) and on the way home it will only drop down to around 27-28.
If I drive it normally (which includes a fair amount of heavy footwork) I can still get 24-25 quite easily and still have fun. When I had my 4.6 3v GT I could barely ever get over 20 MPG (car had 3.73s though) no matter how much I babied it or skip-shifted, but that was a damn fun engine FYI!
I would have to agree with Jim C., the computer in the car is pretty accurate. My car runs right about 1,700 RPM at 60 MPH.
Hope someone finds this helpful or interesting (4.0 perspective).
Tom
I have seen some getting over 30 MPG with their 4.0 including myself, the same trip with less weight in the car the 2013 got 29.
BTW my computer VS hand calculations is normally .5 to 1.5 MPG off, it has been right 1 time in 18,500 miles (last Tank to be exact).
05-05-2013, 12:27 AM
#52
1st Gear Member
Join Date: Feb 2013
Location: MI
Posts: 124
I just did the 20 second highway test in my 2013 V6 automatic with Pony package, 2.73. I got about 28 mpg by the dash computer, with air con on, at 70 mph, about 1600 rpm. Trip average was about 24, as there was some surface street driving and some speeds in excess of 70 
Prior to resetting it, I was getting 20.4 on my daily commute, which is just 7.5 miles of 40-55 mph with a bunch of lights.
Prior to resetting it, I was getting 20.4 on my daily commute, which is just 7.5 miles of 40-55 mph with a bunch of lights.
05-05-2013, 12:30 PM
#55
2nd Gear Member
Join Date: Apr 2013
Location: Gainesville, Florida
Posts: 178
2005 GT, averaging 20-22 around town and about 25-27 on interstate. That's babying it too, if I'm on it in looking at about 16-17 in city and about 22 highway. Has K&N CAI and Corsa axle back exhaust. 5 speed with 3.55 gears.
05-07-2013, 04:02 PM
#56
when I first gotten my mustang I Paid attention to MPG's but now with all my upgrade mods I don't care cause I am all about gettting all the HP I can get from my poney. My last two upgrades will be pro charger and 3:73 gears. When you start to increase fuel and airflow for HP you are going to kill your MPG's....l.
05-09-2013, 10:41 AM
#58
1st Gear Member
Join Date: Feb 2013
Location: MI
Posts: 124
I just calculated a 5-tank average from March to May and it agrees (+0.1 mpg) with the dash computer: 20.5 mpg overall on almost entirely short-distance surface street driving with lights, 30-60 mph.
When I did a highway test in February I got 24, and just recently 28, at 70 mph. Is that difference temperature, or winter vs summer fuel, or just testing variance?
When I did a highway test in February I got 24, and just recently 28, at 70 mph. Is that difference temperature, or winter vs summer fuel, or just testing variance?
05-09-2013, 08:23 PM
#60
3rd Gear Member
Join Date: Mar 2010
Location: Clinton, Tennessee
Posts: 761
I just calculated a 5-tank average from March to May and it agrees (+0.1 mpg) with the dash computer: 20.5 mpg overall on almost entirely short-distance surface street driving with lights, 30-60 mph.
When I did a highway test in February I got 24, and just recently 28, at 70 mph. Is that difference temperature, or winter vs summer fuel, or just testing variance?
When I did a highway test in February I got 24, and just recently 28, at 70 mph. Is that difference temperature, or winter vs summer fuel, or just testing variance?