it was probably a leaking fuel line or something. The reason I know what the fuel burn was - after I landed the FAA released the airplane and the chief pilot came and flew the a/c off from a road (middle of nowhere in indiana). On the way back I calculated it and we difinetely leaned it out. Like I said if I knew what I know now I would have fought it. But at the time everyone was telling me the letter thing wasn't so bad. And yeah I was under investigation. The operator of that flight school is now serving time for tax evasion so I know what an upstanding gentleman he was . Thanks for the replies