Easy Ways to Save on Gas

This is a practical fill-in-the-blank quiz with 13 questions, each one a tip for spending less money on gas.

You complete the missing word in advice like Replace the air filter. A ___ air filter may cost you as much as 10% in fuel economy. so you pick up real driving habits while you play.

One tip surprises most drivers: if you are going to sit parked for at least 30 seconds, it is cheaper to switch the engine off, since restarting it uses about the same fuel as just half a minute of idling.

Recommended level: beginner.