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John, the last one, fuel conversion efficiency, is the most relevant to us. It is dependent on combustion efficiency and work conversion efficiency so we can say the last map is more or less a combination of the first two.
-30 after is like 30 before. So in the maps - is BTDC and positive numbers are ATDC.
It does indeed take a great amount of EGR to get down to 14% especially since there is still a lot of O2 left in the exhaust gasses of a diesel. I don't know how much the TDI EGR system flows at max duty cycle, but seeing how the pipe diameter is fairly bigger than EGR systems on gassers, and the pressure differential can be quite high, it must flow quite a bit.
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