Who defines what efficiency level qualifies? Couldn't they tell you?
I've heard of a few examples of efficiency-related parking perks before, like Salt Lake City, where 50 mpg (EPA city rating) was the threshold.
From Feb, 2006:
Quote:
This week Salt Lake City added itself to a growing list of U.S. cities that reward residents for choosing "green" cars. The reward? Free parking at city meters.
To qualify for the exemption, the vehicle must achieve over 50 mpg (US) according to its official EPA city rating. According to the city's web site, only three vehicles made since 1994 currently qualify: the fuel-sipping '94 Geo Metro XFi model being one of them.
(Care to guess the other two?)
An external news report also indicates that alternate fuel vehicles (and presumably electric cars) qualify as well.
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Source:
MetroMPG miscellany - MetroMPG.com