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Message: <blockquote data-quote="TulsaMike" data-source="post: 4204354" data-attributes="member: 49625"><p>Most pump fuels are already 10-15% ethanol, but the issue with blending if you don’t have an alcohol gauge is what the actual content is. Most ethanol is minimum E50, but it can be up to E85, and as some have stated, if it sits in a underground tank for a while, you never know what you’re going to get. My Audi wasn’t flex fuel so I ended up buying a flex sensor and gauge, and monitoring the alcohol content because my tune was designed for E70 and 36 lbs of boost, so much under e60 would be a rough day if I didn’t swap tunes. My truck now is flex fuel, but it’s blown so I have to leave it at a 91 friendly boost level, or make sure I always run ethanol, or a can or two of torco if I run higher boost.</p></blockquote><p></p>