Incorrectly inflated tires increase surface rolling resistance. many drivers do not inflate their tires to the recommended levels. underinflated tires cause a fuel efficiency loss of 1 percent for every 2 pounds the tires are below their recommended pressure. drivers should check tire pressure with a tire gauge during preventive maintenance checks and services (pmcs). the check should be made before driving, because tire pressure increases with the heat produced from driving. this can give a falsely high reading.

drivers should consider the following:

(1) tires should be inflated at the recommended pressures.

(2) tires should be inflated at the upper level of the recommended range for best fuel efficiency.

(3) tire wear increases and vehicle handling becomes more difficult when tires are inflated incorrectly.

(4) underinflated tires reduce fuel efficiency.