Do you have a roof rack or bike rack on your car or SUV? Take it off and you will improve your miles per gallon instantly. This could be the quickest and easiest way to improve your miles per gallon!

A 2016 study by the Berkeley National Lab found that roof racks account for over 100 million gallons of excess gasoline usage per year in the U.S.

Modern vehicles are designed to slip through the air with as much ease as possible. When you use a roof rack or bike rack, you're interrupting that smooth flow of air, meaning that it takes more energy (gasoline) to push through it.

The most efficient vehicles are the most affected, unfortunately. That ultra smooth and slippery shape on your Toyota Corolla will suffer more from a rack than the less sleek Toyota Highlander.

The solution is so simple! Just remove your rack when you're not using it. The same goes for crossbars — if you're not using them, take them off and save!

Apart from lowering your gas consumption, you'll find that your ride is quieter, too. Lack of wind noise means lack of air turbulence -- and that means dollars in your pocket.