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Old 03-09-2011, 05:45 PM   #10 (permalink)
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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^ Agreed. Ideally, an engine should be set up for one or the other, not both. However, the best we can do to handle both well is a moderate compression engine with plenty of boost. Pull some timing and cut the boost bigtime on gas, and crank it back up on E85, being continuously variable for a mixture of the 2.
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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