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Old 02-28-2013, 10:49 AM
mrMTB mrMTB is offline
Certified Car Nut
Location: Seattle, WA
 
Join Date: Jan 2009
Posts: 101
Mein Auto: Mk6 Golf R
e85 is not more energy-rich than 93 octane. In fact if you were to run the two side-by-side in naturally aspirated motors operating with similar parameters, the e85 setup would require about 30% more fuel, and would produce lower power. (Yes, tuning the e85 operating parameters separately would yield a bit more power than the 93 octane setup, but still with substantially more fuel.)

The benefit to e85 comes in the fact that it is very resistant to knock (FreddyG's comment is correct, in that it has an aparrant octane rating around 100); when used in a turbocharged (or supercharged) application, this allows you to run more boost and timing, which allows you to put more fuel into the cylinder, which results in greater torque and power.
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