Thread: Two overdrives?
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Old 04-26-2011, 10:34 AM   #17 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
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RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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Unfortunately, I can't find any stock dyno charts for my engine, but it certainly has enough low end torque to pull 60mph at 1400 - 1500 rpm. I would expect pretty much any V8 truck / SUV can.

Cleanspeed - Running below peak torque doesn't hurt efficiency. By that logic, I'd need to turn 3200 rpm on the highway, which would be absolutely ridiculous for this engine and vehicle. The goal is to spin the engine as slow as possible without lugging it, or throwing it into fuel enrichment due to too much throttle at cruise.
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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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