If every make and model plane, train, ship, big rig, truck and car had to raise it's MPG one gallon per year then exsisting technology could be improved for long enough that new technologies could be comercialised allowing for a smooth continual yearly one MPG increase for the next 50 years at least.. I know it could be done cheaply enough especially with government research and grants for companies to increase there own research and devolpment and comercialization departments to actually save money for companies and tax payying customers at the same time. This would mean overall it would save money and natural resources and the climate at the same time. Would this be a great start on affordibile energy independence through conservation and the affordible slowing global warming through reduced emmisions at the same time?