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NeilBerry
05-20-2010, 04:27 PM
MPG on 5.4?
MPG on 6.2?
radgt
05-22-2010, 06:46 AM
5.4L I have averaged 14.6. Has gone as high as 18 mpg on highway trip.

Stu
NeilBerry
05-24-2010, 05:27 AM
Not too different than the Lightning MPG.
chadwampler
06-28-2010, 05:16 PM
I've been averaging 13.2 in the 6.2L
mtstep98
07-20-2010, 07:04 PM
5.4 Overall Average 15.5 MPG City & 18 MPG Highway w/ 19000 miles since last August
boozer
08-10-2010, 06:41 PM
Just wrapped a 2000mi road trip...avg 19 MPG. avg speed 70-75MPH. No joke..! I was suprised too..! Dealer and technicians have indicated it should only get better. Of course, put your foot into it and it will be 12-13 MPG.
boozer
12-26-2010, 05:50 PM
After a few more miles, that 6.2 will will give you an honest 20-21 MPG. I'll report out in the spring. Just installed a CAI & 93 flash tune. Hopefully the mileage will remain the same with the added 12-15HP. Merry Christmas!
3ponies
12-30-2010, 10:05 PM
5.4 Overall Average 15.5 MPG City & 18 MPG Highway w/ 19000 miles since last August

This is about what I have done for 8K miles on my 08.
teajay
02-23-2011, 06:56 PM
6.2 Super Crew 12.5 about 900 miles on it so far
mtstep98
05-18-2011, 06:56 PM
We did not buy this truck for MPG's....
socalbluflame
09-20-2011, 12:28 AM
Mine is loaded with the 5Star 91 Octane Performance tune, Hennessey CAI, Synthetic oils, MagnaFlow Exhaust -

City... 14.5
Hwy... 17.2 (Cruise at 70mph)
Pulling 6X12 enclosed trailer... 13.5 (Cruise at 65mph)