How to improve your vehicles gas mileage

1: Check your tire pressure. If it is too low, add air to bring tires to their recommended pressure.
2: Check your air filter. If it is dirty or old, replace it.
3: Run your car's air conditioner less.
4: Drive calmly. Avoid unnecessary acceleration and braking.
5: Tune up your car if these steps do not improve your mileage.
6: Ask a mechanic to check the gap on your spark plugs. Adjust or replace as necessary.
7: Ask a mechanic to look for fouled fuel injectors. Replace them as necessary.
8: Replace spark plug wires.
9: Fill unadultered gas from a decent/same gas station as much as possible.
Tips & Warnings
Sport utility vehicles naturally have poor fuel efficiency, mainly due to their large size.
If you cannot improve your car's gas mileage, seek ways to lower fuel consumption. When possible, walk, ride a bicycle, or form a carpool.
Depending on your car's make and model, driving with the windows rolled down instead of running the air conditioning may cause increased drag, and therefore be less efficient than running the air conditioning with the windows up.
If your gas mileage suddenly plummets, see a mechanic. Your car may have a serious problem.