I'VE HAD MY 2001 RAM NOW FOR 5 MONTHS NOW AND LIVE IN DENVER WHERE IT CAN GET DOWN TO 30 BELOW, BUT NOT USUALLY FOR LONG. I WOULD LIKE TO UNDERSTAND BETTER WHAT I AM PUTTING INTO THE TANK. MOST DENVER STATIONS THAT CARRY DIESEL, REFER TO IT AS PREMIUM DIESEL AND COLLECT A FAT PRICE. TRUCK STOPS...