The fact of the matter is companies, including Picken's Clean Energy Fuels, are already going forward under the current taxing rules.
http://www.fortmilltimes.com/2013/02/25/2516958/clean-energy-releases-third-edition.html
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There are also consumers of the fuel investing in their infrastructure already as well.
http://www.wm.com/about/press-room/2012/20120801_CNG.jsp
http://www.greenprogress.com/transportation_article.php?id=1764
http://about.van.fedex.com/article/cleaner-vehicles
To say they won't go forward with this technology without additional tax payer funds is not correct. Many already have and the list continues to grow.
When I can find places to fill up a vehicle with compressed natural gas I will say you are right. Until then....not so much.