Z4 Roadster (E85) 2008 Z4 3.0si (Hawaii gas question) - Bimmerfest - BMW Forums

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Old 08-30-2013, 02:34 PM
LoveBandit LoveBandit is offline
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Location: Kona, Hawaii
Join Date: Aug 2013
Posts: 23
Mein Auto: 2008 BMW Z4 3.0si
2008 Z4 3.0si (Hawaii gas question)

OK, at this one Aloha (Top Tier) gas station near my home, they sell:

--Regular 87 octane with 10% ethanol (supposedly).
--Premium 92 octane with 10% ethanol (supposedly).
--89 octane WITHOUT ethanol (for boats).

Since my car calls for 91 octane minimum to run to its potential and is sensitive to ethanol (and the fact that gas cost $$$$ here), I was thinking of filling up my Z4 with 1/2 a tank of the 92 (with ethanol) and 1/2 tank of the 89 (without ethanol) resulting in a mixture that SHOULD be 90.5 octane and about 5% ethanol by volume.

Or....I could go 2/3rds of a tank of 92 and 1/3 of 89 resulting in a mixture that should be about 91 octane and 7-8% ethanol by volume.

Or....I could just put the 92 with 10% ethanol in and spend more money overall per gallon.

What would you guys do? The inconvenience of using multiple pumps does NOT bother me that much, I have done it before with another car.

THANKS - LoveBandit
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Old 08-31-2013, 05:51 AM
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GeorgeT GeorgeT is offline
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Location: Seneca, SC
Join Date: Jun 2007
Posts: 1,363
Mein Auto: '07 750i BMW; '03 Z4 BMW
Here in SC, lower grade non-ethanol costs as much as 93 octane 10% ethanol. Personally, I would just use the 92 octane but it's your money. 1/2 and 1/2 should be okay.
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Old 08-31-2013, 09:22 AM
chickdr chickdr is offline
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Location: Atlanta, GA
Join Date: Mar 2009
Posts: 1,372
Mein Auto: '06 M Roadster Imola/Blk
Save yourself the trouble and use the 92 with ethanol. It won't hurt your motor. I use 93 octane with 10% ethanol here in GA.
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