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Old 10-06-2009, 06:56 PM   #1 (permalink)
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I just bought an '09 Si a few months ago, dealer told me to use 87. I recently switched to using 91 or higher because I'm not cheap and want what's best for my car. However, I've been getting worse gas mileage (a few mpg less) driving the same route. What's up with that? I thought a higher grade gas would give me better mileage.
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Old 10-06-2009, 07:00 PM   #2 (permalink)
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dude you weren't even suppose to use 87 in the first place your suppose to use 91 octane
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Old 10-06-2009, 07:16 PM   #3 (permalink)
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If the dealer told you to use 87 octane in an Si, AVOID THEM AT ALL COSTS !
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Old 10-06-2009, 07:21 PM   #4 (permalink)
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-> Ken
Si on 87 octane

I'm sorry, but this has been discussed to death.
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