Question Tires of mismatched sizes: Answers Can be used only on a front axle. Can be used only on a trailer's axles. Should be corrected before driving. Improve fuel economy. Explanation Tires on the same vehicle should all be equally sized. Ensure your tires are not mismatched when inspecting your vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Massachusetts Knowledge Test Class B , West Virginia Knowledge Test Class B ,