If you ran 100,000 miles and made $100,000 and your fuel cost was .169 of your revenue in 2001, then in 2002 you ran 120,000 miles and made $100,000 even if the fuel was the same price your fuel cost would be up because you ran 20% more miles.
Example:
100,000 miles @ 8MPG =12,500 gallons of...