EPAuto Guides

Four short guides with the numbers from AAA, NHTSA and the U.S. Department of Energy.

• FiltersWhen to Replace a Cabin Air Filter

  Three signs the filter is done, the interval automakers give, and how to find the right part number.

• FiltersDoes a New Engine Air Filter Improve Gas Mileage?

  On a fuel-injected car the answer is no. What a clean filter does change, and how to check yours in a minute.

• TiresHow to Check and Set Tire Pressure

  Where the right number is printed, when to measure, and how to top up with a 12V inflator.

• WheelsHow to Torque Lug Nuts with a Click Torque Wrench

  Half torque first, then full, in a crisscross order. And why you check again after a short drive.