Premium Unleaded

BananaHammock74 · 10-06-2009, 05:56 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.

so0fresh · 10-06-2009, 06:00 PM

dude you weren't even suppose to use 87 in the first place your suppose to use 91 octane

FB Si · 10-06-2009, 06:16 PM

If the dealer told you to use 87 octane in an Si, AVOID THEM AT ALL COSTS !

**GeezerSi** · 10-06-2009, 06:21 PM

Si on 87 octane

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

10-06-2009, 05:56 PM	#1 (permalink)
BananaHammock74 Junior Member Join Date: Jul 2009 Posts: 1 iTrader: 0 / 0%	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.

10-06-2009, 06:21 PM	#4 (permalink)
GeezerSi Hidy Ho Neighbor Join Date: Jul 2006 Posts: 25,103 -> Ken iTrader: 8 / 100%	Si on 87 octane I'm sorry, but this has been discussed to death. __________________

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10-06-2009, 06:00 PM	#2 (permalink)
so0fresh Senior Member Join Date: May 2008 Location: SoCal 562 Posts: 374 Sam iTrader: 13 / 100%	dude you weren't even suppose to use 87 in the first place your suppose to use 91 octane

10-06-2009, 06:16 PM	#3 (permalink)
FB Si Senior Member Join Date: May 2007 Location: Flowery Branch, GA Age: 37 Posts: 112 iTrader: 3 / 100%	If the dealer told you to use 87 octane in an Si, AVOID THEM AT ALL COSTS !