I put a new needle in my bike ('04 YZ needle in an '05 WR) and ran a race yesterday and barely got 38 miles on 2.8 gallons of gas. There were alot of sandy creek beds and many of them were fifth gear drag races. I got 80 miles on 2.8 gallons and alot of that ride was fire roads in fifth gear, but I was using the stock needle. I would expect to get less gas mile in the sand versus hard pack, but half the mileage? Can a needle change cause that much more gas consumption?