I have a hard time believing that we're moving the emissions. 1. The efficiency/emissions tradeoff is almost entirely a diesel problem. For intrinsic reasons,

I have a hard time believing that we're moving the emissions. 1. The efficiency/emissions tradeoff is almost entirely a diesel problem. For intrinsic reasons, gasoline engines suffer much less from emissions controls. The relevant systems are both much less complicated and much less intrusive. There is very little efficiency gain available by e.g. removing your catalytic converter. (The vapor reclamation requirements can be very complicated, but those parts do not intrude on the function of the engine, so they are not making the system less efficient) 2. The math doesn't work out on the back of a napkin. Emissions controls can reduce total tailpipe pollutants by as much as 99%. Even if it caused 2x the fuel consumption, how on earth would that result in a 100-fold increase in emissions in the distribution chain?