fully occupied, albeit at only . The General Motors EV1 was rated in a test with a charging efficiency of 373 Wh-AC/mile or 23 kWh/100 km approximately equivalent to for petroleum-fuelled vehicles. Chevrolet Volt in full electric mode uses , meaning it may approach or exceed the energy efficiency of walking if the car is fully occupied with 4 or more passengers, although the relative emissions produced may not follow the same trends if analysing environmental impacts. The Daihatsu Charade 993cc turbo diesel (1987–1993) won the most fuel efficient vehicle award for going round the United Kingdom consuming an average of . It was surpassed only recently by the VW Lupo 3 L which consumes about . Both cars are rare to find on the popular market. The Daihatsu had major problems with rust and structural safety which contributes to its rarity and the quite short production run. The Volkswagen Polo 1.4 TDI Bluemotion and the SEAT Ibiza 1.4 TDI Ecomotion, both rated at (combined) were the most fuel efficient petroleum-fuelled cars on sale in the UK as of 22 March 2008. Honda Insight – achieves under real-world conditions. Honda Civic Hybrid regularly averages around . 2012 Cadillac CTS-V Wagon 6.2 L Supercharged, 2012 Bugatti Veyron, 2018 Honda Civic: 2017 Mitsubishi Mirage: 2017 Hyundai Ioniq hybrid: 2017 Toyota Prius: (Eco trim) 2018 Nissan Leaf: /100 mi (671 kJ/km) or 112 MPGe 2017 Hyundai Ioniq EV: /100 mi (560 kJ/km) or 136 MPGe 2020 Tesla model 3: 24 kWh (86.4 MJ)/100 mi (540 kJ/km) or 141 MPGe Trains Trains are in general one of the most efficient means of transport for freight and passengers. Advantages of trains include low friction of steel wheels on steel rails, as well as an intrinsic high occupancy rate. Train lines are typically used to serve urban or inter-urban transit applications where their capacity utilization is maximized. Efficiency varies significantly with passenger loads, and losses incurred in electricity generation and supply (for electrified systems), and, importantly, end-to-end delivery, where stations are not the originating final destinations of a journey. While electric motors used in most passenger trains are more efficient than internal combustion engines, power generation in thermal power plants is limited to (at best) Carnot efficiency and there are transmission losses on the way from the power plant to the train. Switzerland, which has electrified virtually its entire railway network (heritage railways like the Dampfbahn