Also, gas tanks could be a lot bigger without ruining cars. Things would be slightly less efficient, but if the solution is just being reused then pumping thirt

Also, gas tanks could be a lot bigger without ruining cars. Things would be slightly less efficient, but if the solution is just being reused then pumping thirty gallons at once might not be the end of the world (as opposed to the ten that currently fit in my tank). If the solution weighs as much as gasoline, then that's an extra 120 lbs when the tank is full, which is a lot, but it's <5% extra.