My tires were a few pounds low. I aired them up so the increased mileage means I’ll not notice the latest price increase. If the prices rise any more, I’ll just not accelerate as hard.
A new air filter in about half the cars on the road would give the owner some bonus mileage! Also, if you don't have to have a state inspector up your tailpipe, remove some of the restrictions in the exhaust. A Flowmaster 70 Series and a chisel up the catalytic converter should due..