The 4.0 V6 in the explorer isn't exactly a high power engine, so matching it with a diesel is easy enough. A 4bt is a known good swap, and still gets great mpg, particularly on the highway. I could definitely see 30+ mpg highway out of a diesel explorer (even a 4bt), especially if I managed to break 20 with a 5.9 liter gasser in my Jeep.
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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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