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Interesting theory, Dave!
It also used to be (more than 12-15 years ago) that the cheapest (entry-level economy) cars were the models that returned the best fuel economy in any manufacturer's lineup. Mostly this was a byproduct of being small and light, with relatively small (low-power) engines. Therefore, being very economical on the purchase side also meant getting good mileage.
But more or less since the advent of hybrids, fuel economy has become a "feature". With few exceptions, if you want the best MPG in a lineup these days, you have to pay extra for it.
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