redline works best during winter when diesel antigel additives kill the cetane rating (Nate should remember that discussion from this past winter). During winter I lost mileage from 34 mpg to about 30 mpg (loss of about 60 miles per tank). With redline I got it back to 32.5 - 33 mpg.

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"