RACK and pinion electro-hydraulic power-assisted steering (EHPAS) is standard on the Cooper. While most power-assisted steering systems use hydraulic pumps that are continuously driven by the engine, the steering pump in the Mini is operated by a small electric motor that works independently of the car's engine. Because EHPAS only operates when required, BMW claims it cuts fuel consumption by up to 0.1 litres per 100km compared to a conventional system.