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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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