I live in the piedmont of Virginia, we just don't get too many sub freezing days but we do get them. I'm looking for a cost effective fuel additive for my area, one day it will be 30 F and two days later it will be in the upper 60's. I talked to the VDOT mechanic that use to take care of my truck and their routine was a can of Diesel Kleen injector cleaner every oil change. just want your opinion on the matter. At present it is 74F this November 12. NO, that is not an invitation for you Yankees to move here.