Tire pressure is like drinking caffeine. Too little and your car is sluggish- using about 0.4 % more gas for every psi (pounds per square inch) under the recommended number. Too high and the over-inflated tires will make the car rattle and shake.
So maintain the correct air pressure in your tires. You can find the psi number on the driver’s door jamb or user’s manual. It’s usually around 32-34.I check my tires at home with a little pressure checker thingy. Gas stations do have machines, usually in a corner somewhere, and either broken or with a line of people waiting. See, you’re not alone! Take a couple of minutes to save gas– and have a safer ride too!