If you go to a Gas Station on Barranca near Woodbridge, and go to a Gas Station on MainStreet x Harvard, and you compare Octane over Octane (87 vs 87, 89 vs 89, or 91 vs 91), do you notice the price differences per gallon? Are you interested in knowing if either gas station can save you up to $8-9/tank, depending on which gas station you go to? Depending on which gas station you go to, you could be actually saving $8-9/tank or spending an extra $8-9/tank.