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Now, to be perfectly clear: This is a theoretical, on paper idea. I realize that there's a billion other variables to this equation.
That said, the thought process here is, in real world ideology, to compare in regards to the idea of, say, an engine swap to a different engine or changing out transmission for different gear ratios, all while still using the rest of the car. Even then, there's obviously variables...
The other real thing to learn from this thought is that, with proper pulse and glide, does it really matter what your drive train is?
Take that suburban for example. If you were to swap in a smaller engine, would you really gain anything in terms of economy, assuming the smaller engine used equivalent technologies? Hard to account for an automatic transmission, since you can't apply the same P&G methods quite the same here.
Just an "on paper" discussion about what's under the hood, not so much the vehicle, tires, aerodynamics, etc.
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