update : FT-Bh

This Geneva motor show concept outlines Toyota’s vision of a hybrid family supermini for 2020. The FT-Bh, which stands for ‘Future Toyota B-segment hybrid’, offers a claimed fuel economy of 134.5mpg and CO2 emissions of 49g/km. It is powered by a two-cylinder, 1.0-litre petrol engine, developed specifically for the concept and mated to a special version of Toyota’s Hybrid Synergy Drive electric motor, which is almost 90kg lighter than in the Prius.
The FT-Bh is a similar size to the Toyota Yaris, while the car’s shape is optimised for aerodynamic efficiency, with a 0.235 drag coefficient, which is below the current average for a supermini.
Whereas the 1.0-litre Yaris weighs 1030kg, the FT-Bh tips the scales at just 786kg thanks to the use of high-tensile steel, aluminium and magnesium in the construction process. Toyota has also focused on thermal efficiency, low driving resistance and a reduction in the amount of energy used by the car’s electrical components.
The FT-Bh has also been conceived as a CNG-powered car or a plug-in hybrid, with the latter producing 19g/km of CO2. Although the FT-Bh is a show concept, it has been developed using existing motor industry technology that would, in theory, enable it to be produced at a competitive price for a high-volume B-segment supermini.
It is more likely that the lightweight, fuel-efficient thinking behind the FT-Bh will be seen on future cars.