Eco-conscious performance; responsive handling; refined, luxurious interior; active-safety features; leading-edge tech options; supercar-level performance from the M5. The BMW 5-Series stands out as a traditional luxury sport sedan that not only offers strong, uncompromised performance but also some leading-edge safety and connectivity technology. Increasingly, the 5-Series has an advantage over most of its rivals in that it offers more fuel-saving measures than most other sport sedans, with items such as Auto Start/Stop, turbocharging, direct injection and a special Eco Pro driving mode combining to provide significant gains in gas mileage. A diesel model, the 535d, offers yet another fuel-saving powertrain option. Otherwise, the 5-Series sedans offer more comfortable, refined cabins than other sport sedans, and the 5-Series Gran Turismo body style is a good pick for those who want a little more cargo flexibility. The M5 performance sedan remains one of the best-handling and best-performing 4-doors on the market at any price.