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      02-04-2013, 07:32 PM   #18
PR3CI5N
need4speed
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Drives: 2010 E90 M 335i
Join Date: Jun 2010
Location: West Coast

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I'd add 4-5 gllons of E-85 and switch to map 5. As long as you don't go over 45% ethanol you'll be fine. Over 45% and you'll start running too lean which is no fun because of check engine lights and misfires.

If you don't want to run E-85, just stick with your 93 and switch to map 2 or 5 because you'll notice a huge torque/power improvement. Your IS can handle map 2 or 5 with no problem.
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