Reducing fuel consumption is a huge issue as evidenced by CAFE. I can't imagine clean air is so much the need (with how clean modern automobiles run) as simply to reduce supply depletion. So my question is how much would it help reduce petroleum supply depletion by reducing motor oil waste due to too short of oil change intervals. Seems there is a lot of savings to be had and it is strange the government leans so heavily on fuel economy and appears to totally ignore motor oil use (not so in Europe I understand). Now I am not one to proomote government regulation, but it sure is irksome when so many opportunistic oil change places push 3000 mile OCIs to pad their bottom line and of course the back of a bottle of Valvoline says to change your oil every 3000 miles too. Just venting to some degree, but also wondering. How much crude oil does it take to make a gallon of gasoline, vs to make a gallon of motor oil?