Further cleaning up comes via the regular petrol Panamera S and all - wheel - drive Panamera 4S; their 4.8 - litre naturally aspirated V8 is replaced by a 3 - litre twin - turbocharged V6 engine with more power and torque (414bhp and 384 lb ft
versus 394bhp and 368 lb ft) and an 18 per
cent improvement in fuel economy, which now tops 26mpg.