I remember reading some online analysis about how Esso gas used to be one of the worst because of the higher sulphur content (sulphur is a leading cause of acid rain). It was within spec of what the government mandated, but it was quite a bit higher than many of the much cleaner competitors. I believe Esso has since reduced the sulphur content in its gasoline, but they are not in the Top Tier program, so for things that I don't know enough about, I prefer the standards guaranteed by some sort of certification program.
In the past, ethanol-blended gas from Husky/Mohawk gave me some slightly better tail pipe emissions at the expense of a minimal drop in fuel economy. My engine seems happiest (smoother, more powerful) with Chevron, and both Petro Canada and Husky gas seem to work quite well as well. SuperStore gasoline was definitely the worse as far as power is concerned, but the engine never exploded either.
Different engines could also be happier with different brands of gasoline (due to their additive packages). It is best to try a couple of tanks of the same gas from different retailers, and do some data logging to determine which brand seem to work best with your particular car.
-Lik |
發表於 2009-4-13 10:57
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