When you fill the cans, do you remove them from the rack and place on the ground to fill?
I have filled them in the rack, I am not sure if it's the best idea, but I haven't been yelled at by a gas station employee. I know that filling tanks in the back of a pickup with a plastic bed liner is a no-no.
Here in the "People's republic of California" your not even suppose to use gas can that are not certified by the California air resource board. I hate the California legal gas cans, they supposedly don't leak the gas vapors to the atmosphere. But they leak half your gasoline when filling up equipment or a motorcycle, what kind of environmental savings is that?