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I switched and although it hasn't been an apples to apples comparison, I found no difference between 87-93. I switched to 87 when the weather started cooling off and even though I drive a lot of freeway miles and there have been major traffic back-ups over the last couple of weeks. Anyway 42.8mpg(93oct) to 42.1(87oct) was the best comparison on I got. My last fill-up my average went down to 38.1mpg because of the stop to go traffic on the freeway.
 
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