The public are being cowed by the new, shiny cars & trucks. There's no freaking reason a pickup truck should cost what it does, but the manufacturers are grabbing people by the snout and dragging them into the dealerships to sign their lives over.
What 'remarkable' increases have been made, other than the few good examples at the top? The CAFE Standards link from DOT shows "In 2012, NHTSA established final passenger car and light truck CAFE standards for model years 2017-2021, which the agency projects will require in model year 2021, on average, a combined fleet-wide fuel economy of 40.3-41.0 mpg."- well, that's not gonna happen. Instead, it also shows "The EPA also said that early projects suggest fuel economy will jump to 25.7 mpg in the 2020 model year, which would be a new record."- that's well short and if they think progress will be made when the manufacturers can buy carbon credits from each other, they're delusional.
What high fuel economy data have you seen that's not available here?
There would be no comparison if those pinheads who conflate need and want had bought smaller cars, but with the "It's bigger, so it's safer" mantra, little shoebox arss will remain the minority.