Chevrolet C/K 1500 Forum : “Gas Mileage”

u could try a tune up(spark plugs, distributor cap and rotor, plug wires and a fuel filter) For the fuel gauge it could be a problem with your sending unit.  check the wiring just a few ideas for you

that is the 5.7 TBI, throttle body injection motor. On mine, I put a true dual exhaust system and gained about 3.5 MPG but if you do just a full magnaflow system with a high flow catalytic convertor you will get 3 MPG better, the truck had that on when i got it. Just make sure to baby the gas pedal, and yes, your gauge is the same as all of them, up to 96 they had the same gauges from 88-95. They do tend to jump around in those trucks. If you watch it closer, its more like 3rds of a tank, when u fill it to 3/4, 3/4 to 1/4, then 1/4 to empty. I have the exhaust system and a K and N air filter, which also helps. the cold air intake doesnt really make a difference, just get a K and N. I also have a 3" body lift and some other mods, and I get about 15 averaged between town and highway. Let me know what you get, what you do to the truck and how it helps. good luck.

PS...o ya, and dont waste your money on a throttle body spacer, they dont work.

Thanks Tim for the info. I have about a 3" body lift with 33" Mud tires on it now, which don't help but I am looking for roughly 18" tire and wheel packages right now w/low profile to help that problem.  As for the K and N air filter, and a TRUE dual exhaust, I am gonna probably just wait and have my parents get that for me for christmas or something. I am only 17, lol....so hopefully they help me out a bit.

my truck does the same  with the gas gauge i have a 89 chevy with dual masterflow exhust lifted 4 inches with 33 ich yokohama tress

one of my buddys had a hypertech chip in his 5.7 L chevy and he got like 3 more mpg. if your truck is tbi you wont have a obd2 plug in and you will have to get a chip that replaces the stock one in your computer. i have a stock 1998 chevy z-71 and it gets about 13 crusin around.