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Originally Posted by SkauneJohan
For us normal deadly converting a car to E85 or E96 and adding a small gasoline tank for startup is much easier, also how they did it in brazil from my understanding
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The auxiliary tank used to be the rule at least until 2010 when Volkswagen released a version of the Polo fitted with electric pre-heating of the fuel, and in few years this became the prefered approach. I don't remember if any new car still has this tank.
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Blending is easiest both with vegoil and ethanol, no need for expensive conversions 
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Blending is easier with ethanol than with veg oil. At least when it comes to compatibility with emissions control devices which has been more critical on Diesels.