With most of the late model electronically controlled engines, if you mess with them much at all, they will not run nearly as well and will get MUCH poorer mileage. Maybe you could get a bit better mileage with a Cummins by careful modifications, but I think 30 is pretty optimistic. You can"t fool the computer.
25mpg late 60"s Caddies? As I remember, most big cars with big engines got around 10 to 12, and 15 was considered exceptional. My slant 6 Mopar Darts and Valiants, which weighed half as much as a Cadillac would only get about 20 to 23 with manual transmissions.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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