Don't bother. A diesel isn't throttled, so there's nothing to gain in terms of pumping losses. The warmer, less dense air simply reduces the amount of fuel that can be burned fully (any more and it starts smoking), meaning you get less power, and the same mpg.
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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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