I moved to E85 on the 06 Hemi Ram and 2012 5.6 Titan after finding that they were knock limited on pump premium. MBT was higher than 93 octane could support without detonation. Both engines are under 9.8:1.
I found gains of up to 20 ft/lbs in parts of the torque curve and a peak to peak HP/TQ gain of about 6%. Fuel consumption increased roughly 25%, however cost analysis compared to pump premium was within pennies either way. E85 was over $1 cheaper per gallon than 93. I like the extra HP/TQ and cleaner running engine, so I stuck with E85.
On the Titan I was actually able to alter the intake valve timing advance tables to advance the camshaft at a lower rpm, increasing overlap and advancing the ICL, increasing overlap and the dynamic compression ratio at lower RPMs to make even more torque.
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