I think we're seeing pretty clear evidence of it right now. Americans in sprawling cities that get used to low gas prices buy giant gas guzzling cars and then f

I think we're seeing pretty clear evidence of it right now. Americans in sprawling cities that get used to low gas prices buy giant gas guzzling cars and then freak out like none other when prices go up. The subsidies are almost certainly helping to line some investor and executive pockets, but they probably also have some effect driving down prices.