I am not punching holes in the results that you have posted, but it is not apples to apples. The FORD had the worse milage because it was the heaviest and has the lowest gearset. The CHEVY was the lightest and had the tallest gearset. If all three weighed the same and had comperable gearsets, they would be close to each other.
Honestly with 350 HP and 650 FT/LB, who needs deeper gears than 3.73??? I have driven many trucks and towed alot in different terrains. When towing a heavy load I can expect to climb hills slower than empty. I know a guy that recreationaly tows a 5th wheel only a few times a year. He had a Chevy 2500 with the 6.0L. He did not like loosing speed in the hills so,,,, he sold it and bought a Chevy 2500 6.6L. Only to be able to not drop 5 MPH in hills... He probably gave up some milage too...
I have a 1979 Chevy C20, 3.73, TH400, SB 350, 4BBL. It tows well, but the fuel economy sucks (old college truck). So for under 10K-12K loads I installed a B&W hitch in my 2001 K1500 4x4, 5.3L, 3.73, 4L60E. Sure it does not "JUMP" like it does empty, but it is LOADED... I can get the same milage loaded with the 2001 the 1979 gets empty.
Here is my "Tow Rig"
I guess I just won't be COOL for not buying a big Bad Azz, fire breathing diesel to tow my tractor 3-4 times a year 120 miles round trip. I just cannot justify the diesel fuel cost, and increased maintenance cost for my limited useage. Even if I burn up my transmission one day a rebuild is still cheaper in the long run than the total cost of ownership differance between gas and diesel for non-commercial use.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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