This is analogous to another current affair isnt it. It's clear that legislation has steered the course of vehicle develoment with a strong grip, and it's been the spur to drive very specific advancements in 'energy management' and pollution and it would be interesting to see what the industry would look like had they faced no regulations. I couldn't even imagine; 14L-20L passenger car engines, uncatalysed, everyone's got 1200hp at least, still using carbs. Lead and manganese everywhere, cancer rates skyrocket (even compared to today's standard). I don't appreciate CAFE telling me which grade of oil to use in my property as much as anyone but you have to admit we're seeing some very clever solutions.