It's really a waste of money to use the higher octane gas. It really won't do you any good, performance or mileage wise. Stick with the regular 87 stuff. I use Union 76 and have no problems with performance or gas mileage. Chevron is good gas, but the most expensive. I wouldn't use the cheap, discount gas 'cause it tends to be more dirty and watered down, so it doesn't burn as efficiently. I've noticed gas mileage differences between AMPM gas and Chevron.