Quote:
Originally Posted by Taylor95
I'm not sure. A lot of other Jeep owners have done the TDI conversion, but they report mpg to be in the 30s. However, none of the builds were eco minded and the ZJ is already a lot more aerodynamic than other Jeeps.
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People often look at displacement as the only defining factor of how much more efficient an engine might be, yet it's not an absolute rule-of-thumb. Sometimes a noticeably larger engine revving much slower (or maybe not so much slower) may provide a similar mileage or even better than a more rev-happy small one. On a sidenote, the electronically-governed version of the Cummins ISB3.9 rated at 203hp factory-fitted to the Brazilian F-250 from late-'05 to 2011 and backed by a 5-speed ZF manual could reach around low-30s if driven by someone not too lead-footed.