The real strawberry on the cake is,   

In addition to the great economy and the environmental benefits of converting an old petrol Vehicle to LPG the government are offering an "LPG Rebate Scheme" 

to us it seems like a government reward for doing something smart.

Every vehicle converted to LPG gets a rebate, please read details below.*

*(an extract from the Australian Government AusIndustry)

The Australian Government has established the LPG Vehicle Scheme to offer a grant to assist with the cost of a purchase of a new dual-fuel (petrol/LP) or dedicated LPG vehicle or an approved and fitted LPG system.

For any further information, call the AusIndustry Hotline on 13 28 46 or visit www.ausindustry.gov.au