Its straight forward. Pickup a book and read up if you'd like.
On level ground: -Coefficient of drag x Frontal Area is the largest factor as its a squared relation to speed -Weight is just a straight ratio to rolling resistance and semi trucks have very high pressure low rolling resistance tires so they do better lb for lb -Pickups have a lot of excess displacement in their engines they have to power (bearing areas, rings sliding on walls, etc), where a semi doesn't have nearly the excess.
Result is an aerodynamic semi and a modern truck at the same speed get fuel economy roughly proportional to their frontal areas.
Throw in some hills and things get much different as the fuel to drag the weight up the hills will put the lighter vehicle far ahead in a relative comparison.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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