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<< Another dumb thing many people do is buy premium gas when 99% of cars in the US are tuned for 87 octane. Can you tell everyone how you know this, and please provide us with facts to back up your statement so that it doesn't come off as one of the most lame remarks on the forum. >>
Have some more coffee, Senior Member Seattle (can I just call you Chief?), this is so true it hurts. Look in ANY owner's manual for the past lebenty years or so - almost all domestic cars do the 87. Some notable exceptions to this LONG ESTABLISHED INDUSTRY WIDE PRACTICE are many Acura, Volkswagen, and Honda models. It's about the only dumb thing these brands do, the price difference obviates any achieved efficency gains. >>
It depends on the car, but this is generally the case. People often don't read their owner's manual, because it's mostly common sense. This is one little bit of useful knowledge you can get outta all the boring 'yeah, duh' info in an owners manual.
87 octane is between $1.55 (Beacon, where I buy gas) and $1.90 here in San Jose. That's a pretty big difference in prices, and no reliable data to show any gain in performance for the expensive station's additives. It was cheaper about a month ago, goin' back up it seems.