Speedlover quote:
"I just went with the assumption that a level on the bike seat means the seat is level for all intents and purposes. Isn't that what we're after (as a starting point)?"

HuH? Think about this statement. What if you level your seat and the bike is on a 3% incline? Now the nose will be pointing down as your level on the seat says level. Now if you decide to recheck it on a 3 decline???? Don't bite your tail!!!!!

I'll stick by the bike must be level first for any seat tilt adjustment. Now you have a true statring point