Grand tourers differ from typical sports cars (e.g. Lotus Elise, Porsche 911) in that they are usually larger, heavier (sometimes more than 3,500 lb (1,600 kg)), and tend to make less compromise in comfort for the sake of driving ability. For this reason, most have front-mounted engines, which leave more space for the cabin than mid-mounted engines. They tend to have softer suspensions to provide good ride quality. They also provide bigger storage space and more accessories. However, grand tourers do have similarities with sports cars, such as their use mainly of rear- or four-wheel drive, and the term sports car may be used to describe a car with grand touring qualities. Very high-performance grand tourers, such as the Aston Martin DB9, Ferrari 599 GTB Fiorano, Nissan GT-R and the Mercedes-Benz SLR McLaren, may be considered to be supercars.