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when i used to run e85, i would put three gallons in with the rest 93 octane.
yes, the performance was there and it was a nice added gain, but my car did not run as strong and consistent as it did when i did not run e85. i was having some rough cold starts (which is common) along with rough idle and overall performance being sporadic.
from my research, it puts a very large strain on the stock fuel pump. i have stopped using it until i am able to see the long term effects of it on our bimmers and their components.
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