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Originally Posted by Alan06SUT
You are making it too complicated. Weight is the biggest thing. Aero only comes into play at higher speeds (hwy mileage). Its all about getting the right motor for the right vehicle. The torque and horsepower curves need to jive with the everyday use/reqirements of the vehicle. An underpowered vehilcle is constantly working to keep up, and adequately powered vehilce remains in the engine's sweets spots longer.
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ditto....
E F F I C I E N C Y
it's all about the ability to produce the power with the given amount of fuel.... all other factors remaining the same. Obviously there has to be a breakover point in the design of a engine to reach the best efficiency to utilize all the fuel and gulp enough air to burn with it as it forces it's power against the forces of the vehicle that want to make it remain stopped.
If you simply assumed the smaller you go the better, a motorcycle engine would be the best, but it won't since it would be at full throttle all the time just to keep the vehicle from stopping.
Small engines don't belong in trucks.