Been poking around online looking for a fuel additive to combat winter and crap diesel.
Happened upon this stuff:
Gets rave reviews from the powerstroke/etc groups and a bottle treats ~500 gallons(125 for the winter stuff). Even better is they are normally ~$12 each but they are deeply discounted due to the holidays. Also found a coupon code for an extra 10% off (DIESEL10). Each bottle came to $4.03. At that price I picked up a couple of winter additive and a couple of normal.
Just saw 15% off code(FRIDAY) and free shipping over $50.