chipping a 05 duramax?????

[treveiger]

Originally Posted by clinebarger

The best way to increase MPG on a common rail diesel is to advance the injection timing.
http://www.efilive.com/

How do you do that? We just need a gas saver, its got plenty of power for what we use it for and we dont want anything that is hard on the truck or will hurt it. How do EFIlive's work? I would like somthing as simple as possible and dont want it to hurt the truck at all.
Thanks