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      11-17-2011, 02:41 PM   #12

Drives: 2007 335xi
Join Date: Sep 2009
Location: Colorado Springs

iTrader: (0)

Originally Posted by steve.kodra View Post
The true octane raiting of E85 is about 94-96 according to "If a retailer chooses to post octane, they should be aware that the often cited 105 octane is incorrect. This number was derived by using ethanolís blending octane value in gasoline. This is not the proper way to calculate the octane of E85. Ethanolís true octane value should be used to calculate E85ís octane value. This results in an octane range of 94-96 (R+M)/2. These calculations have been confirmed by actual-octane engine tests." You can read more at

I usually run 50/50 ish of a blend. The mods I have are as follows: JB4, Meth, ETS FMIC, AR C@tless DP's, BMS DCI, CDV delete. I run Map 3 all the time with a max boost of 17psi.

Let me know if you need to know where to buy meth and 101, 105 unleaded in Denver.
Not saying that this wiki data is incorrect, but a few questions come up in reading it for sure...

Supposedly the octane calculations are incorrect becasue they were "incorrectly" done for ethanal mixed with gasoline instead of just pure ethanol... Isn't E85 a mix and not pure ethanol???
Also, the Wiki data points to a report that claims "backed up by octane tests"... I followed these links and found no evidence of any tests only the same summary claims repeated...

Again not saying any of this says the wiki report is false, but the N54 performance results seen to date seem to indicate the possibiliyt of the lower octane claims being incorrect