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.
Many major gas companies offer a discount on your gas bill, you just have to know what to look for and who to talk to.
How to save money by improving fuel economy and performance in any vehicle by up to 30% or more without expensive gadgets. Gas Mileage Bible is a must for anyone who drives a car. Simple scientific explanations on what causes losses and gains in fuel economy. Clear-cut gas-saving solutions, breaking down into straightforward categories: "no tech", "low tech", and "high tech".
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