I have a 04 Blazer with a 4.3L. Bought it new and the fuel mileage has never been good. (13 city - 16 hwy) Dealer says it should average 16 city & 21 Hwy -- the Fuel economy information (reported to the EPA) states that tests have mileage ranged from 13 to 19 city and 17 to 25 hwy
Blazer: 2WD w/tow package
The dealer has changed out the dist. cap, rotor, plugs and wires, induction service with no change.
I tried a tornado fuel saver and the mileage got worse. Don't know if I damaged a air sensor.
Any ideas?
Thanks,
Terry