BlueEFFICIENCY – the trademark for exceptionally economical and ecofriendly Mercedes passenger cars – is a package of measures compiled by development engineers across all disciplines, the main aims being to reduce weight, aerodynamic drag and rolling resistance, to further optimise the engine technology, and to make energy management even more efficient. The Mercedes commitment to reducing fuel consumption and carbon-dioxide emissions targets actual driver usage profiles. As part of a large-scale field trial, the typical driving profiles of Mercedes customers were ascertained and combined in an in-house fuel-consumption test covering a total of almost two million kilometres. Hence the positive effects of the BlueEFFICIENCY concept are most noticeable during everyday use of the cars.