Figures for the regular 911 Carrera have not yet been confirmed, but on the WLTP cycle the Carrera S is capable of a combined 31.7mpg, dipping to 31.4mpg for the Carrera 4S (not a huge drop considering the additional driveline components). That in turn equates to CO2 of 205g/km and 206g/km for the respective rear- and all-wheel-drive cars.
Those figures are actually quite realistic, as you’d hope from the WLTP test. A touring figure of 30mpg or more certainly isn’t out of reach in our experience, though it’s worth mentioning that for all the supposed economy and emissions benefits of turbocharged engines, we achieved much the same figures with similar ease from the old naturally aspirated models…
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Extend the flat-six and you can expect lower numbers, but with a 64-litre fuel tank (67 litres in the 4S) you can expect a tank range of 350-400 miles.