Manufacturers of gas engines include Hyundai Heavy Industries, Rolls-Royce with the Bergen-Engines AS, Kawasaki Heavy Industries, Liebherr, MTU Friedrichshafen, GE Jenbacher, Caterpillar Inc., Perkins Engines, MWM, Cummins, Wärtsilä, GE Energy Waukesha, Guascor Power, Deutz, MTU, MAN, Fairbanks Morse, Doosan, and Yanmar. Output ranges from about 10 kW (13 hp) micro CHP [combined heat and power] to 18 MW (24,000 hp).[5] Generally speaking, the modern high-speed gas engine is very competitive with gas turbines up to about 50 MW (67,000 hp) depending on circumstances, and the best ones are much more fuel efficient than the gas turbines. Rolls-Royce with the Bergen Engines, Caterpillar and many other manufacturers base their products on a diesel engine block and crankshaft.