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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