Actually it does matter becuase anytime any car is produced and sold anyplace it affects everyone.
1) For each person that purchases and drives a higher milage car we see benefits world round.
Less gas consumption equals less demand.
Less air polution equals cleaner air and water
2) Anytime one manufacturer does something that makes a difference the competing manufacturers stand up and take notice.
It is so typical American to look at the world from an egocentric point of view. I see it every day when idiots drive like they own the damn road! Driving is a privlidge and we all share this planet.