bad news, matt:
<a href="http://metrompg.com/posts/mpg-miscellany.htm"><img src="http://metrompg.com/posts/photos/ParkingMeterXFi.jpg" hspace="3" border="0" width="130" height="160" alt="free parking!" title="free parking for Metros!" align="right" /></a>
to qualify, the vehicle has to get 50+ mpg (US) in the EPA's official city cycle rating.
according to the city's web site only 3 vehicles made since 1994 currently qualify: the '94 Metro XFi being one of them - woo hoo metro!! (care to guess the other 2?)
Salt Lake City "Green Vehicle" parking permit