well let me list some things
Take your tires to stock height
Take the ride height back to stock
New air filter
New fuel filter
New spark plugs
New cap
New wires
New O2 sensor since i'd put $500 that you nor the last owner has changed it (important!)
Wheel alignment
Check your exhaust system and replace if necessary (especially catalytic converter)
from that done you may double your mpg also slow starts, no fast hard acceleration and do no more than 60 mph on the highway and the least amount of stop/go/stop/go/stop that you can find to each of your routes
Put back on the stock wheels and tires and stay at 55mph on the freeways, slow starts from stop lights, etc. Keep the truck tuned up. Don't use the Air-conditioner....
Put back on the stock wheels and tires and stay at 55mph on the freeways, slow starts from stop lights, etc. Keep the truck tuned up. Don't use the Air-conditioner....