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I tried 87 once when gas was $4/gallon, and my car was angry and slow for about a week. Then again, I have a turbo model. With that and the A/C running, it took forever and a hard foot into the gas pedal to get the turbo to boost up - otherwise the 2.3 engine is very slow under 2 1/2K rpms, and low-quality gas only pronounced that lag.
I usually use 89, and performance is much better, but 93 makes a world of difference in how quickly the turbo starts to boost up (esp. around town) when I splurge for it.
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