Sorry if my message above was impolitely worded. You're driving serious miles, so I can understand you're trying to save some money. If the car calls for 91 octane, you can compromise with mid-grade (89) on one fillup, then 93 in the next. Here in Mississippi, I found that if I go to the gasoline station attached to the Kroger supermarket, the price is 10 cents per gal cheaper if I scan my Kroger card. Today, premium was $2.72/gallon. (European readers, you must be shaking your heads in amazement that gas is still so cheap here.)