What kind of gas mileage are you guys getting? I have an 87 K5 with stock 10 bolts (dont know ratio), 700R4, 35" tires, and engine mods (Edelbrock heads, headers, cam, intake, K&N, dual exhaust, custom chip). I am not 100% sure on what I get, as my odometer is quite a bit off and my gas guage doesnt so much work but I think its around 11-12 or so on the highway and 8-10 in the city. That seems pretty low to me for a TBI. I know the engine mods sure arent helping and neither are the tires (this isnt the most aerodynamic vehicle either )but still think it should be a little higher? I seem to remember getting around 16 or so before all the mods but it has been a few years since I first owned the truck. I am going to be getting a new 700R4 built next month and will also be buying a 14ff with Detroit and 4.56s. I am guessing that will help in the city but hurt on the highway? Also I want to upgrade my throttle body but dont know if I should just get the CFM Tech package or the Holley and have my intake bored out. Which one you guys think would be better?