hopefully the ultimate answer to "why is my mileage bad?"
ok, MANY people ask why they get bad milage, and I hope to answer it, feel free to add to this post!
Parts only last so long.....
plugs, about 35,000-50,000 (carb) or 50,000-100,000(efi) miles
wires, 75,000-100,000 miles
cap/rotor 80,000-100,000 miles
O2 sensors 50,000-270,000 (I am still on my ORIGIONAL O2's, however I clean mine with carb cleaner)
timing is adjusted properly
high enough octane? just cause it wil run on 87, does not mean that it will run good
are your tires propperly inflated? this can hurt you allot!
are you driving more than 5 miles at a time? You will see an improvement if you drive 30 miles in traffic over 4 miles on the street
what is your gear ratio? a 3.73 is better around town, but a 3.27 is great for the highway....
what are your shift points? try short shifting, racers use it to conseve fuel.
also, roll into the throttle, a lead foot eats gas, and is hard on the car