My '08 2.4 five speed is getting 27-29 m.p.g. with the mixed type of driving I've done.Last tank was 27.98,the one before that was 29.33.I've noticed that the engine has already loosened up some(about 500 miles ago)and that running the a/c noticeably cuts into the gas mileage(along with making the car harder to launch from a stop.It either bogs or chirps the tires.I haven't found the ideal launch r.p.m. with the a/c running).

 

Drove around 3,600 in 9 days driving from CA to MT. most of the driving was going 80+ mph, or in the low 20s going through Yellowstone and Glacier Natl Parks. Averaged 31.4 mpg on the trip computer, and calculated around the same. Surprised considering the mountain passes we went through and going up slight uphills and downhills in NV and Idaho.

 

My 08 Panel got 28.9 mpg on the way up to NC from FL.I was only doing the speed limit.And that was with 600 or so miles on the truck.Came back got 24.6 mpg .That was doing 80 to 90 mph.So i think the more you push the petal the less mpg you will get.My 98 vette gets 27.3 mpg at 80 to 90 mpg.Design has alot to do with it.

 

OK, I have not reset the MPG counter in 2700 miles and it shows 30.8. 4800miles on the car now, MPG seems to be getting better. I'm going to reset it all at 5000 miles and start over. Changed the oil to SYN at 3000 miles too. Winter is coming, so they change the gas here, and longer warm ups in her future. I'm going to enjoy the Auto Start feature and heated seats...hahaha...