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IMHO, it is not worth it. Here in NY the savings on E85 as opposed to straight gasoline is almost a non factor. If I were to run E85, I would have bought a vehicle set up to run that fuel. BMW has not set up their vehicles to run E85 and I am sure they would void your warranty in a heartbeat if they find that you are running E85 in your vehicle. I think it would be pretty easy to void most mechanical failures other than suspension if E85 is found in your BMW. I did in fact have a Tahoe that ran E85 and the MPG was absolutely horrible and the loss of power was very noticeable as well. In the end it's up to each owner to make the call on what they want to do.
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