The 100-mile-per-gallon car has arrived but it's still a niche item. Change on a grand scale will only come when we get beyond the early adopters and that will happen when either the price of technology comes way down or the price of gas goes way up.
The billions of dollars that the US sends to Middle Eastern countries to import is a choice. This has led Amory Lovins to state that there's more oil in Detroit than in Saudi Arabia. There's actually no oil in Detroit, but the reluctance of auto executives to pursue higher fuel efficiency standards, imposes billions of dollars of cost on North American companies and car owners.