Tom, Chuck is giving you some good info. I also average about 13 Gph for a few hour flight. You will see about 19-20 gph on take off. You can start leaning in climb ( I usually get back to 17 depending on the OAT. If I am up at 14-15,000 ft and willing to slow up with less power i can get back to about 9 gph (lean of peak) Jack N55XL