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Nice story, but you are tuned for 98 octane. Of course anything lower will not go well. The OP's car is "tuned" for 87 by BMW, and does just fine putting around at 65-70mph. Then a journalist expert comes to tell him that he will get better mileage if he uses 93, which he did/does not, and a bunch of other arm chair mechanics proceed to tell him to buy a Prius...
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