Hmmm. I didn't read the fine print too carefully before voting. I was thinking I was getting a mileage discount for every 100 feet in elevation. I like that idea a bit better. You should also knock a mile off for each degree above 90 deg F when relative humidity is over 80 pct, half that off for you desert people. I could dream up another layer of additions for high-mileage riders, but I've complicated it enough already.