Your engine should be properly tuned in. Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage. Just remember that though results vary based on the kind of repair and how well it is done.

Fuel Economy Benefit: 4%
Equivalent Gasoline Savings: $0.13/gallon

Checking air filters regularly and replacing if it is clogged with dirt is important. By means of replacing a clogged air filter can improve your gas mileage by as much as 10 percent. Your car’s air filter keeps impurities from damaging the inside of your engine thus, if it is clean all the time and effectively filter your engine will be working effectively again. Not only will replacing a dirty air filter save gas, it will protect your engine.

Fuel Economy Benefit: up to 10%
Equivalent Gasoline Savings: up to $0.31/gallon

By means of keeping your tires properly inflated to the proper pressure it can improve gas mileage by 3.3 percent Under-inflated tires can lower gas mileage by 0.4 percent for every 1 psi drop in pressure of all four tires. Properly inflated tires are safer and last longer.

Fuel Economy Benefit: up to 3%
Equivalent Gasoline Savings: up to $0.09/gallon

Using recommended motor oil in your ride can improve gas mileage by 1-2 percent. Also, look for motor oil that says “Energy Conserving” on the API performance symbol to be sure it contains friction-reducing additives.

Fuel Economy Benefit: 1-2%
Equivalent Gasoline Savings: $0.03-$0.06/gallon

Also, change your spark plugs to high performance plugs. High performance plugs will improve your cylinder combustion which will increase engine performance.. well.. I’ve leaned this one from my dad.