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I use Stanadyne Performance Formula in the summer and winter, and the DK spring and fall. It's pricey compared to others, but I get a real 2-3 mpg. increase over any other additives I have used. It helps smooth out the rough winter and it shines in the summer heat when my truck gets its worse abuse.
I love everything about all Stanadyne products excep for the $$$. Same goes for BG products too. Quality costs more because its worth more.
The only place I found the Stanadyne near me was Camping World. The problem was they only had a small bottle and it was very expensive. Search online and you will find thier websites or try to email them.