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A 50mpg truck with current parts might be possible with current parts.
Take something like a 1970's or 1980's toyota or datsun/Nissan pickup. Nice small frontal area and there was even a 1 ton version of the Toyota. then put a modern diesel (like the Cummings 4bt or similar) which would actually improve performance over the old engine. A good matched overdrive transmission.
Then an aeroshell, belly pan as much as practical etc and it should at least come close.
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