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Old 07-29-2010, 11:34 AM   #9 (permalink)
comptiger5000
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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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When I eventually do some computer tuning on the Jeep, I plan to make it use TC lockup much more aggressively, as well as tweaking the downshift points. I should be able to get it to break 14 mpg around town no problem then.

Of course, being able to go to 85% throttle at low rpm isn't possible in this thing anyway, as it's got too much low end torque, so it picks up FAST. Unless you're turning less than 1100 - 1200, it's got plenty of pull even at 40% throttle (I can pass people uphill on the highway EASILY in OD with the TC locked, even if I'm going slow and only turning 1400 when I start picking up).

Trying to pick up at more than 50% around town wouldn't be sustainable, unless there were no cars in front of you. Plus, between the noise and the acceleration, it would attract plenty of attention from cops.
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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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