Hello all, New to forum, I have a 1994 Suburban K2500 4x4 7.4 454 with 146,689 original miles. I am located in High Point NC. Just looking for some fellow gear heads, information and support. Will post pic later. I am having major problems with gas mileage. I would like to change out the Tbi with an aftermarket, just cannot seem to find one. Does anyone here know of any type of upgrades that will help with gas mileage. I am getting between 8 and 9 miles per gal. I know I can do better. No check engine light, but runs a little rough also.