> median fuel effeciency due to government requirements As if engines weren't improving due to other factors as well, like market forces for lower fuel costs a

> median fuel effeciency due to government requirements As if engines weren't improving due to other factors as well, like market forces for lower fuel costs and improved overall technology? What if there were more sensible regulations that taxed externalities directly, like pollution taxes? This is a pointless, illogical politicization of a topic more complex than you're aware of.