The four-wheel drive system is simplicity itself; in normal circumstances the front/rear drive split is 80/20, but when the ABS system detects front wheelspin, more torque is automatically transferred through a viscous coupling to the rear. Renault says the system maximises fuel economy, although that again raises the question of whether you need the extra weight of four-wheel drive in the first place. If and when you do take the RX4 off-road, the system works well; Moroccan desert terrain ranging from rocky tracks to steep, sandy hills posed no problems. There was some kickback through the steering on rough surfaces but the suspension travel and ground clearance were perfectly adequate, and the ride quality was good. It did feel a little soft on asphalt roads but not excessively so, and, with the exception of offset pedals and an awkwardly high clutch action, was a pleasant and comfortable drive.