That car would be legal in Wash state for sure, I am sure it would be in some of the others as well. It really does depend state to state. It's even a push button dash display so you wouldn't even need to change the gauge cluster to one that shows the odo and speedo in miles. It would be about $600 in fees from a Registered Importer to get all the paperwork done, in Washington state anyway. As for people in any states closer to where MetroMPG is, you'd have to do your homework to figure out what was required.
