I have used Diesel Kleen from Walmart sporadically over the past four years. Have not really paid attention to my mileage with and without it. However, on our 1400+ mile trip (not towing) from FL to MI this past Dec, I did indeed notice a big jump in mileage (for a diesel). Normally around 18mpg. However, the first 700 mile leg averaged 21.5 mpg and the second 700 mile leg averaged 19.8 mpg. I just realized that I had used the Diesel Kleen for that north bound trip only...
BTW, that is a 2002 Duramax with 170,000 miles on it.
|