1. Tire pressure gauge
Many modern cars can read their own tire pressure and digitally report the results. But if that’s not your car, a simple tire pressure gauge is easy to use and small to store.
The purchase can also pay for itself in gas savings over time, as we detail in “30 Online Purchases That Will Start Saving You Money on Day One.”
Consumer Reports recommends checking your tire pressure at least once a month and before starting on a long trip.