Diesel Fuel  By C.J. Baker  Ask people what they know about
gasoline and most folks will tell you they know the current
price and that the local station sells three grades. Ask if they
know the difference between the three grades and, if you’re
lucky, they’ll tell you it’s the octane rating. That’s about
where the common knowledge stops, although you might get a few
misunderstandings thrown in, like premium fuel is good for a car
even though it requires only regular. Now, if you’ve managed to
keep the conversation going this far, ask people what they know
about diesel fuel. If you get any response at all, other than
“Nothing”, chances are it’ll be incorrect.  Depending on the
crowd of people you’re quizzing, you might get responses like
these: “It costs less than gasoline.” (maybe, depending on
market conditions); “It has less energy than gasoline.”
(incorrect); “It has a peculiar smell.” (correct, but so does
gasoline); “It won’t burn if it is spilled, such as in an
accident.” (incorrect); “It’s oily.” (corr