Cars of higher fuel efficiency can be found in other countries, but due to current regulations those are not allowed to be sold in the U.S. in an effort to lower our use of foreign oil there shouldn't be a limit on how fuel efficient a car can be.
Cars of higher fuel efficiency can be found in other countries, but due to current regulations those are not allowed to be sold in the U.S. in an effort to lower our use of foreign oil there shouldn't be a limit on how fuel efficient a car can be.