Computers are allowing the impossible to happen.
"Based on current estimates, the new engine in the Mazda3 will be able to deliver a fuel consumption figure that is close to 3.3L/100km. By comparison, the best official combined figure achieved by the current 3 is 5.7L/100km, while even the Toyota Prius carries a 3.4L/100km rating. "
https://www.carsguide.com.au/car-ne...for-30-per-cent-efficiency-boost-report-50373
