Most drivers have probably noticed that gas prices can vary wildly, even within the same state or town. Here's why that is and how gas prices work.

“If your car requires 89 Octane, you can usually save money by mixing 87 Octane and 93 Octane. For example, if you are getting 15 gallons, you could get 10 gallons of 87 and then 5 gallons of 93,” ...