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Originally Posted by 31_bandits
about the premium -vs- regular thing. octane, and GMs recommendations, and so on and so forth are of course familiar to me. Octane isn't the only difference between premium and regular, and with a 5 to 10 cent price difference, i say go with my as-stated not-entirely-scientific impression that premium yields a little better results. |
Well, the oil companies clearly
you.
The "octane rating" measures a fuel's tendency to knock or ping against that of pure octane, which has a rating of 100.
"Premium," my ass. The only difference between regular unleaded and "premium" versions is that the higher-octane stuff burns slightly slower; some cars (but not many, and nothing in the Hummer line) may need that. Beyond that, there is no advantage to running "premium" gasoline. None. So why is it marketed as being better, although nobody says exactly how it's better? Because many consumers are stupid enough to believe it. "Premium" gasoline does not improve mileage, increase engine life, start quicker, increase power or anything else. It just burns infinitesmally slower.
Use regular unleaded unless 1) your owner's manual recommends a higher octane rating (in which case you really could violate your warranty by using regular unleaded) or 2) you legitimately have a case of engine knock, in which case you may wish to check in your HUmmer for service ASAP.
I hereby step down off the soapbox.