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Negatives:
Harder working fuel pumps
Worse fuel economy (e85 has less energy density)
Could affect rubber seals
Turns to corn syrup (ask anyone with a carb'd motorcycle that's sat for a while)
For many people, the higher octane and boost are worth the tradeoffs.
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'07 E92 335i 6MT
Full Bolt On's, Vargas Stage 2's, Carbon Fiber, and Methanol.
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