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<blockquote data-quote="Allen" data-source="post: 368458" data-attributes="member: 389">One of the things that modern computer controlled engines need is consistency in fuel grades.&nbsp; The computers control timing, air/fuel mixture, and ????.&nbsp; As the engine runs, the computer is constantly evaluating the data and will eventually make some minor changes to increase power/efficiency.&nbsp; If you are constantly bouncing back and forth between fuel containing ethanol and fuel without, the engine's computer gets a little frustrated.&nbsp; Worst I have ever seen with this was a damn Dodge van we had at work.&nbsp; We were mandated to use E85 in that POS unless there was no E85 available.&nbsp; It had a lot of trouble starting and running right.&nbsp; We eventually received permission from above to abandon the E85 crap after it was in the shop X number of times and the dealer told us to stop using E85 in their E85 labeled POS. I will occasionally put the E15 crap in the tank of my 4Runner.&nbsp; It seems to run fine when I do, but I notice (anecdotally anyway) that the economy drops by ~2 MPG.</blockquote>

[QUOTE="Allen, post: 368458, member: 389"] One of the things that modern computer controlled engines need is consistency in fuel grades. The computers control timing, air/fuel mixture, and ????. As the engine runs, the computer is constantly evaluating the data and will eventually make some minor changes to increase power/efficiency. If you are constantly bouncing back and forth between fuel containing ethanol and fuel without, the engine's computer gets a little frustrated. Worst I have ever seen with this was a damn Dodge van we had at work. We were mandated to use E85 in that POS unless there was no E85 available. It had a lot of trouble starting and running right. We eventually received permission from above to abandon the E85 crap after it was in the shop X number of times and the dealer told us to stop using E85 in their E85 labeled POS. I will occasionally put the E15 crap in the tank of my 4Runner. It seems to run fine when I do, but I notice (anecdotally anyway) that the economy drops by ~2 MPG. [/QUOTE]

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