The cetane number is perhaps the characteristic most associated with premium diesel fuel, as an analogy to premium gasoline with higher octane ratings.
I own a 95 gas wagon and over my year-and-a-half experience (around 17k miles) during which I consistently tracked and calculated fuel economy at every fill-up (and there are a LOT of ´em in there, believe me), I have never realized less than 9 mpg for a single tank of gas.
The use of cetane improver also helps to maintain acceptable fuel mileage.
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