I carry three five gallon cans,one for diesel/truck,one for gas/generator and one for boat/outboard motor mix and at the end of a run I put the diesel in the truck and gas treatment in the others. One time I pulled into a BP station for diesel and the place was a total dump and the guy in front of me was telling me how slow the fuel was pumping only then to be told by the attendant that the lazy owner hasn't changed the tank filters in forever so I immediately poured the five gallons of diesel into my truck and headed for the next station and my fuel injectors remain happy to this day!!