I did it. I ordered a G-force supperchip for my 4.8, 2011 Chevy. Says money back if I don't get 4 more miles per gallon. We'll see. Anybody else had any luck with these things? Has anyone sent one back ?

Mike

 

you won't get more than 1 mpg...and that's if you baby it. you'll be sendin it back. get a custom tune. bulldog was the same for me