The emphasis on MPG is driven by regulation, not consumer choice. Auto manufacturers are required to satisfy fleet-average MPG requirements that have continuously risen over years. Most low- and mid-hanging engine efficiency improvements have been picked, so drag reduction is just about all that's left. This is why the large bulk of modern cars all look like identical eggs even though consumers would pay for non-egg cars in the absence of regulation, and don't understand why cars look so much more boring than a few decades ago.

https://en.m.wikipedia.org/wiki/Corporate_Average_Fuel_Econo...