When you get back from the trip, fill the truck with the fuel in the spare can first and then top off the tank. Then refill the spare can for the next trip just before you leave. Then the spare fuel is as fresh as the start of the trip you are currently driving.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels