so i just joined up last week. iv got a 2002 gmc sierra 1500 4x4 5spd 4.3L. when i bought the truck i was getting 14mpg on a good week. after maitence and mods im now getting 20ish. its also window here and im now running with a fiberglass cap and LT studded snow tires. i suspect better millage when the weather warms (and better fuel quality).
unfortunately my daily commute contained mostly up hill one way. doesnt make for potentially amazing results haha.
im also located up in maine at sea level right on the cost.
mods to my truck include a proper tuneup, 3pc aluminum underdrive pulleys, upgrade to electronic injectors, k&n drop in filter with modded air box, flow master exhaust that exits infront of the rear tire, electric cooling fans, and a custom hptuners tune to accommodate a stoich of 14.2 for 10% ethanol.
2002 GMC Sierra 4.3 (W), 5spd, 4x4.
Mods: K&N drop-in, modded air box, modded throttle blade, X injectors, Flowmaster 50 series, BBK underdrive Pulleys (3pc), e-fans, personal HPT tune.