The £12,790 on-the-road car has a conventional petrol tank, but also has an LPG tank in the boot. A switch in the car activates the change from petrol to LPG. The £1,695 conversion was carried out by specialist Hendy Power Conversions, in Hampshire. The car, on a three-year/ 60,000-mile contract with full maintenance and RAC cover, costs £312.76 a month to lease and carries a residual value of £4,635. That compares with Lex Vehicle Leasing's monthly rental and residual value for a conventional petrol-engined Megane Classic 1.6 RT of £274.09 a month and £4,433 respectively.