Nerys - E85 tuned engines can be more efficient (although not enough to fully make up the economy difference). Being that E85 has higher octane, they can have significantly higher compression (which makes them more efficient), as well as aggressive timing advance. That also lets them make more power.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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