That new engine is a VVTi Toyota powerplant similar to those currently used in the Elise, but in a new 1.6 litre displacement. The new motor will power the basic Elise S model, and reduces emissions to 155g/km of CO2. As a conservative estimate, fuel economy should be in the early forties mpg, yet coupled to a new close-ratio six-speed gearbox, performance even from the basic 1.6 should be as impressive as ever.