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' 53% BTE '
A BSFC map would be instructive, as we could 'see' where the 'island' of lowest fuel consumption occurs, and the rpm bandwidth in which it resides.
For ground transport, road loads are transient, requiring the transmission to keep the engine at the 'sweet-spot,' if operating at 53% BTE is to ever be realized with OTR transport.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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