The Australian government will give up to a $2000 subsidy for LPG conversions. Some states offer additional incentives as well.
http://abc.net.au/news/newsitems/200608/s1713855.htm
http://abc.net.au/news/newsitems/200608/s1714379.htm
http://www.smh.com.au/news/NATIONAL/Mot ... 55887.html