Mr. Ugly

Sounds about right for frequent short trip driving.

MrSandman

I used to get 16-17 on average with my 07 (auto w/93 race tune and 3.73 gear). Funny though, I get about the same (19mpg) with the 5.0

TheDutchTexan

I get about 19 on average (calculated, trip computer is not really accurate).

The mustang is still a lot of car for a v6, it has to work harder to achieve the same.

ski

Cold temps will also reduce the mpg's. When the ambient drops way down below freezing, I have to drive at least 5 miles before mine reaches normal operating temperature.

JIM5.0

The only way to get over 20MPG avg over a week's period is to get no less than 60% of your weekly mileage on freeway driving with speeds above 60MPH.
If you very rarely break 55MPH in your daily commutes, your avg MPG will suck, and royally.

I have a CAI 93octane performance tune in my car right now, and with at least 60% freeway driving above 60MPH, I observe around 20-21 avg MPH and that is out of a bigger engine, a 5.0L Coyote.

In straight city with speeds less than 55MPH, I observe way lower avg MPG, about the same you see out of your car, 14-15 MPG.

The bottom line is the tune and CAI requires you to dump more fuel into the engine, otherwise your would be running too lean.

What you can possible do is buy a tune for fuel economy if that is your prerogative. Get an 87 octane street tune and request economy as the primary focus of that tune and you will see your MPG go up some, maybe a pinch above stock tune. And you will still see some power increases too, believe it or not.

JAMAMAN

Cost of doing business !!!

Nuke

I know for a fact that my mileage on my '07 goes down from 55-60 MPH on up. When I do a steady cruise at 50-55MPH (try the Natchez Trace Parkway's 50 MPH speed limit from Natchez, MS to Nashville!) I get 26-27 MPG hand calculated on more than 2 occasions. My steady state highway mileage at 70 MPH is 24 MPG and at 75 it drops to 22 MPG. About 90% of the 37,000 miles on my non-DD Stang are all highway.

I suspect that, for the 4.6L, the optimal engine RPM for best fuel mileage is in the 1400-1500 RPM range

ikemikestang

You didn't get a mustang for gas mileage..

But i get around 13-14 and i have a heavy foot at red lights.

ski

With mine modded as shown in my sig, it gets 20-21 mpg in warm weather and 19-20 mpg in cold weather when driven around town at 30-40 mph with red light stops every 1/8-1/2 mile, and an occasional WOT run.

Also, a well written modded tune should normally not cause lower mpg than the factory tune if the engine is warmed up and running POT, because the ECM is in the "closed loop" mode receiving signals from the O2 sensor, which sets the A/F at a continuous stoichiometric value of approx. 14.7:1.
A modded tune, however, may cause lower mpg than the factory tune when the engine is cold or running WOT, because the ECM is now in the "open loop" mode, and the A/F ratio is being governed by the tune's tables in the ECM's memory.

StevesStang10

I have a 2010 vert GT Premium with a Steeda CAI and SCT tuner and drive from Hendersonville to Nashville daily through the same traffic. I got about 17 mpg on the stock SCT tune, then increased to 19.5 to 21 mpg with a custom tune from Bama. I'd check the tune. BTW - The 97 octane race tune from Bama is sick