I keep hearing about how expensive european Diesels are  but I think
of what we pay for our used cars and then I see cars like this for
sale in Europe.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=1
30271369956

Add to that I was watching Top Gear and they had a Big Twin Turbo
Jaguar that was getting over 50 MPG !

Perhaps the solution is just a high minimum MPG for any vehicle which
is configured to take 3 or more passengers?

(well that or convert the US Fleet to run on Natural Gas like they are
doing in Iran).....