If anyone cares, those "contour lines" on the graph showing g/kWh stand for grams per kWh. 1 gram of a benchmark (reference) diesel fuel has about 18362 BTU/lb or 42.7 MJ/kg, if anyone cares. 1 kW is equivalent to 1.34 HP. In the large engine biz we used to use g/kWh all the time, but in the US we usually use BTU/kWh.

This is undoubtedly a mechanical fuel consumption based on shaft output at the engine. If you hooked your diesel to a generator you could theoretically figure out how much fuel it would burn, if you ran it at (for example) 1800 RPM and knew the generator efficiency (probably 92--93% for a small one) at the output you were pulling from the generator. Just as a reference, the best large slow speed, 2 stroke diesel engines will do ~165 g/kWh.

Rgds,
Chris W.
'95 E300D, 422K

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