If there are 20,000,000 vehicles on the road and oil is functional for 20,000 miles how much oil is wasted each year? Conspiracy between big oil and big auto? I think so!

(may be broke/outdated!)
If there are 20,000,000 vehicles on the road and oil is functional for 20,000 miles how much oil is wasted each year? Conspiracy between big oil and big auto? I think so!