Both the Mercedes-Benz E200 CGI and the E250 CGI are basically powered by the same 1796cc four-cylinder motor albeit in different states of tune. How can a smaller engine make as much power as that of a much larger one? The answer is charging – turbocharging in this sense. The BlueEFFIENCY is the trademark for exceptionally economical and eco-friendly Mercedes passenger car. it is a package of measures compiled by development engineers across all disciplines, the main aims are to reduce the weight, aerodynamic drag and rolling resistance, to further optimise the engine technology, and to make energy management even more efficient.