Full disclosure I have a Ford 3.5 ecoboost and am happy with it.
BUT the only way to increase efficiency is to increase engine efficiency. You cant make a smaller engine and say it will get better fuel economy. You might gain a small amount from less engine friction but a truck requires the same amount to power to achieve its task. Gas can be rated in btus and its the easiest way to think about truck power I think. The smaller engine needs the same btus of energy to accomplish the task which means the smaller engine will use about the same fuel as the v8 to accomplish the task.
Theres no free energy out there.
Footnote, you can increase efficiency by things like turbos hp fuel, leaner burn, compression ratio... This post is purely about engine displacement.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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