I recently got my 07 classic 3500 dually and decided to use Stanadyne Performance in my fuel. My questions is what ideas do you have for measuring and adding the fuel to the tank. If you are almost empty it's easy. But, if you are adding fuel to a tank that is not empty, you have do do some figuring and measuring. As I figure 1 oz. will treat 3.75 gals. of fuel (16 oz.divided by 60). What do use as a fill bottle. I guess you need some sort of long neck container graduated in ozs. Thanks.