Mileage is different for everyone, you can't say you should get this or that. I've got 25 redlights in a 12 mile commute to work, no one will get good mileage on that route. I'd pick up an easy 3 mpg if I drove in from the opposite side, open roads 55mph and hardly any stops. Big difference IMO.

 

I get 13.5 MPG, straight highway, at 70MPH. I have a 2005 crew cab 6.0 with 4L80 4 speed and 4.1 gears... What do you all think about the hypertech tuners?

 

Cookie cutter tune box... They are crap.

 

 

get a real tune. at least a mail order, but a live tune or dyno would be even better