Both the Flying Spur V8 and the Continental GT V8 feature
intelligent cylinder deactivation tech on the V8 engine, which uses only four of the eight cylinders (hence making it a V4) at cruising speeds, in order to minimize fuel wastage.
Bentley says that the engine comes with
cylinder deactivation,
intelligent thermal management and electrical recuperation, allowing the car to have a range of 840 km on its 90 liter fuel tank.