As environment conservationists continue to call for improved fuel-efficient cars, BMW is introducing its new 5 Series -- a number of vehicles ranging from saloon to touring models. Officials say improvements to the BMW 5 Series' engines help obtain maximum fuel economy and minimum emissions. The BMW 5 Series also offers a wide range of innovations in driver assistance and comfort features including Active Steering, a High-Beam Assistant, BMW Night Vision, a Head-Up Display and Lane Change Warning.