According to many experts, the best way to improve the truck's fuel economy is to add a tonneau cover. A tonneau cover will help reduce aerodynamic drag and can improve gas mileage by as much as 10%, see below for details.

Do tonneau covers save gas Mythbusters?

According to another study conducted by SEMA, the tonneau cover increased their truck's fuel economy, but only while driving at a certain speed. ... According to a test conducted by Mythbusters, it improved their truck's gas mileage by 5%.

Are tonneau covers worth it?

A tonneau cover is absolutely worth the investment. From preventing loss or damage of your cargo, boosting your truck's looks, improving the fuel mileage, preventing quick wearing out as well as retaining the resale value.