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View Poll Results: Which gas will perform better?
91 octane, pure gasoline 2 28.57%
93 octane, 10% ethanol 5 71.43%
Voters: 7. You may not vote on this poll

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Old 02-21-2009, 05:06 PM   #1
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Join Date: Feb 2009
Location: Omaha, NE
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91 octane gas or 93 octane E10 ?

It looks like I have a choice between 91 octane gas, or 93 octane E10. What would you choose?

If I understand it right, the 91 has more energy. However, the E10 shouldn't pre-detonate as easily, which apparently lets the ECU advance timing for max power.

I'm primarily interested in performance, but also problem avoidance.

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Old 02-21-2009, 06:09 PM   #2
Join Date: Mar 2006
Location: Seattle Area
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Go with what's recommended in your owners manual...always.
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Old 02-21-2009, 07:02 PM   #3
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Location: Wisconsin
Posts: 2,112
93 E10 is all we can get in WI, no issues after 75,000 miles on BP Premium. My car (when out west) runs like crap on 91.

1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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