8th Generation Honda Civic Forum - View Single Post

BananaHammock74 · 10-06-2009, 06:56 PM

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.

10-06-2009, 06:56 PM	#1 (permalink)
BananaHammock74 Junior Member Join Date: Jul 2009 Posts: 1	Premium Unleaded 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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