A four cylinder Detroit Diesel with turbo, 185 HP at 2,500 and 435 FtLb at 1,500, should get about 20 mpg empty. I'll let yall know how it goes when I am done.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-