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Old 06-29-2011, 11:11 AM   #11 (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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Being that you have a diesel (unthrottled), downshifting and lighter throttle doesn't hurt your efficiency as badly as a gas engine. Also, whether it's worthwhile to punch it, slow down, or downshift depends on how much power the engine has. If it can't hold speed at less than 80% throttle in top gear, you're probably better off slowing down.

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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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