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...