With easy access to ample local supplies, Victoria is the main user state, accounting for about 53 per cent of Australia's annual consumption. The Mix Motor vehicles run on propane or a mixture of propane and butane. Propane and butane are gases at atmospheric pressure and temperature but can easily be liquefied for storage by an increase in pressure. The most common blend by volume is 60 per cent propane to 40 per cent butane. Industry uses propane or butane and the petrochemical industry may use both as a feedstock.
Households use only propane.
This growth has been largely due to the tax-free status of LPG which results in a significant pump price differential compared to petrol. LPG vehicle conversion kits are also exempt from sales-tax. Recent studies of car emissions have shown that when compared to unleaded petrol, LPG emissions for oxides of nitrogen and carbon monoxide were slightly higher in well tuned vehicles. Evaporative emissions of hydrocarbons are virtually zero. It does not need lead or other additives to boost its otane rating.