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The graph is a contour plot of a hill, the top of the hill is the best engine efficiency. The dotted line is trail that goes along the hill. This is where the engine operates on level road. BMEP is how much the engine is loaded, the bottom is no load, top full load at any given RPM. KW is the engine power output, the upper graph. The curved lines going up to the left are engine power isolines. So at 2500 RPM at the dotted line, the car needs 20 KW on level road and uses 300 g/kwh so 300*20 = 6 kg/hr of fuel. Diesel is .8 kg/L so it burns 7.5 L per hour, so that 2 gallons per hour and if the car is going 60 mph at 2500 rpm, that would be 30 mpg. There's a 190D for sale on CL in st louis I saw.
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- Tony
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