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Over here, northern Europe, a 5 % mix of Ethanol in both 95 and 98 Octane has been standard for a long time. Have not noticed any issues with my Box at all, no power diff either on those few occasions where I use 99 Octane without ethanol. Also been running a Bi-fuel Volvo on E85 for three years now without issues. Guess there are some minor adaptations in the fuel system both regarding material and programming. The Volvo has a slight power increase on E85 compared to regular gas
However 10% Ethanol could be above the spot where there are no noticable problems for cars not prepared for it.
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