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Old 09-02-2011, 08:49 AM
98540iA 98540iA is offline
wannabe DIY'er
Location: Rocky Mountains
 
Join Date: Nov 2010
Posts: 332
Mein Auto: '98 BMW 540iA (born 9/97)
I'm pretty sure it's used only in winter months and at most is 10% so the pumps all have stickers stating 10% ethanol. I am no expert and have no proof of this.

I've also heard it will bring mileage down and performance as well, however I don't think we as consumers have much of a choice as pretty much all gas stations have this.
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