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This thread makes feel really stupid. I bought my 07 new and have never put anything less than premium fuel in it, believing it was better for the engine. I live at 7000'. So i'm going to give the 85 octane a chance and report back with how it does.

Traveling from home (6600') to work (6900') is 15 miles. I always put 87 octane in my '07 and get 46 mpg. Two weeks ago my wife and I rode from our place in Park City, UT to Jackson Hole, WY. The mileage was 5602 when we left. Our total combined weight with gear was 469.6 lbs. I put 91 octane...