Even though the mechanical aspects and basic concept of auto engines hasn't changed a great deal, the electronics/computerization of them has certainly made them more efficient not too mention cleaner. I remember reading an article comparing engines only as far back as the 80's that were putting out over 200 times the polutants as compared to a modern engine....might have been the same article that said driving a Porsche Turbo through Los Angeles actually helps clean the air.

Half of communication is listening. You can't listen with your mouth.