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I thought about that but still coundn't explain it. I don't have the specific BSFC chart but the peak torque is at 2000 rpm. However like any engine, efficiency depends mostly on load rather than rpm unless you are at very low/high rpm. That can be seen on the attached graph from a 2 liter TDI engine, from 1500 to 3000 rpm, engine load is what influences efficiency. So I can't really understand how 1700 rpm with a higher load can be less efficient than 2000 rpm with a lower load. I also have the MPG graph of a Lupo.
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