Quote Originally Posted by 7072 View Post
Hey Mark,
What did you do to make your truck get 30 mpg??? I am new to the forum, I just bought my first diesel a 2007 chevy crew cab LBZ. I have been researching this forum, and everywhere else I can read to find which tuner to get for the best fuel mileage and all I am doing is getting more confused !!!!
Welcome aboard!

30 MPG isn't unheard of with a 6.2L. I can produce that reliably with my 85 under the right conditions. 20-25 MPG is typical. Not a likely goal for any post-6.2L truck (very common for 6.2L equipped cars), and certainly not with any late models. There are exceptions, of course, and many have come close (to the 20-25 mark). I can easily get 25+ MPG with my 2001, but it's a painful and deliberate process (easily overcome by convenience).

Tuners/chips are very subjective, and depend on too many variables to form any conclusions that apply to everyone. Equipment and driving habits can cause full swings in performance/economy. The best advice any of us can give you is to read up on all of your options, and choose according to your abilities, needs and conditions. What works well for me (or any individual) may be completely ineffective for you. In the end, if your goal is economy, it will take more miles to see a return on any significant mileage improvement expense than most people can/will drive the same truck.