This gas station had no heights marked on the canopy
by the time I discovered this it was too late to back out into heavy traffic and besides the gas was cheap! Asked the cashier how high, didn't know.
Several climbs of the ladder and inching forward I had 4 inches spare at the edge of the canopy over my vent cover. Relief. But then realized the canopy lights were lower and staggered, so had to do a bit of a slalom to get thru.
Lesson learned: None, I would do it again for cheap gas