Tman,

That's with
a C172 filled to the tabs -- leaving exactly 1 hour of reserve,


One little trick I use in all aircraft, even those with a "BOTH"
setting on the tank selector: I don't set it there. I conciously fly
from either the left or the right tank, switching regularly to avoid
imbalance. The reason do it: When the tanks get emptier, I can keep a
known amount of fuel in one side while flying the other down to (near)
empty. Much better than having everything empty at the same rate, IMHO.

--
Thomas Borchert (EDDH)