Does any one have a hypertech thermomaster chip, with a 180 thermostate in there jimmy or blazer. If so plese let me know what your getting per gallon, and if it is really worth it. I get 13.5 mpg. I have a 4.3 vortec.
i get about 16.5 or so if i dont play to much otherwise 14.5 to 15. highway is roughly 20-22. i would say something is not right cuz with my old 85 2.8 carb i was getting 14. maybe you are running rich all the time. im not a genius when it comes to fuel probs though so i dunno. hope i helped/