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Slowmover, that chart in post #170 was exactly what I was referring to (to not use). That's BSFC vs engine speed at full load. So 1800 rpm would be optimal if you're running up at 100% load--but that's almost never the case, so that particular graph is not really useful for our discussion here.
Okay, I'm all for clarification. I wondered what you were posting. It's still the only thing I've found. And those of us with trucks have a tendency to hook up trailers, carry gravel, etc. Not disputing your point. (Therein enters the question of gear choice, road speed and EGT when heavily loaded: optimum rpm on grades, etc).
I can tell you that the basic characteristics are the same as that TDI map that I referred to earlier (post #37 in that other thread).
Then how do we use it? I haven't read up on how others interpret these maps since we didn't have one. I much appreciate your pointing out this map.
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