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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