their Silver is their mid grade, the Premium 24, 34 or 65 will have more available power than their mid grade but compared to what the actual spec for the truck (from when it was new) it probably has more available juice than the original battery did. I go for highest CCA I can get, that I can stuff in the available space for the battery. Cuz I live in the cold, and I have been known to play "musical batteries" when I get a different vehicle. so I get all I can out of a given battery. I don't cheap out.