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I believe you are referring to a Brake Specific Fuel Consumption (BSFC) mapping (typically at full WOT loading)...correct?

To my knowledge, GM has not displayed BSFC maps for ANY of their vehicles as they treat that information as "Propriatary Information" (PI) -- which it really isn't -- because, only the software mapping code inside the ECM is truly PI.
 

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I think that is the kind of information, which the industry seldom gives happily to the free distribution... Someone has managed to find the ones for Volswagen TSI engines: Ominaiskulutus, hyötysuhde ja polttoaineenkulutus - the text is in Finnish language but the images can be found scrolling down.

What i'm trying to do is some kind of model of fuel consumption in different loads (=throttle position) and rpm. I have done one by using some generic 1.6l free breathing engine map...
 
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