Keeping your tires inflated properly and your engine running right is critical to efficient motoring. Underinflated tires can lower your fuel economy by full miles per gallon. (Get the proper inflation pressure from the sticker on your car’s doorjamb or the owner’s manual, and not the tire’s sidewall.) Even if your car seems to be running well, that perplexing Check Engine light could represent a dead oxygen sensor or some other emissions control problem that causes the vehicle to waste several miles per gallon.
An Ounce of Prevention