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Originally Posted by Maui Nick
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. |
how about i add 3) my impression is that the engine runs smoother and my 5 best mileage tanks have been on premium, and 2 lowest mileage on regular, with alot of mixed mileage in the space between, generally implying that mileage is better on premium. Avg to date is about 5% better, avg cost for premium is about 3-4% more.
I think, but don't know, that premium here is 100% gas, and everything else is 10% ethanol (except E85 which is obviously 85% ethanol).
