Gas prices have skyrocketed, with the national average at a whopping $4.17 per gallon. At one California gas station, itβs a staggering $7.29 per gallon for premium fuel. But there are things you can do to make your car go further for less. Make sure your tires are properly inflated, and lighten your carβs load. AAAβs Doug Shupe says to fill up when you have a half-full tank. Waiting until youβre almost empty can lead to buying the most expensive gas because you donβt have a choice.