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Concrete is right.
You can't really say that a 1.6 TD has a BSFC of 265 g/kW-hr at 1800 rpm. That statement is only true at a specific engine load that will generally be between 75% and 100& load. If this engine will put out enough available power at 1800 rpm so that your cruising load is only 50% throttle, you will be consuming far more than 265 g/kW-hr at cruise. Same goes for the 1.9 TDI.
Given that the 1.9 TDI will put out more power than the 1.6 TD at a given geared engine speed at a given road speed in the *same* vehicle (identical cruise power requirement) the 1.9 TDI will operate at a much smaller percentage of engine load than the 1.6 TD.
Since I can't locate a BSFC chart for the 1.6 TD in an amount of time I'm willing to devote to the search I can't see whether there are plausible scenarios to indicate which would be more fuel efficient in a given application. Generally engines of this size in a compact vehicle application cannot be forced to operate at a high enough load to achieve the exact operating point required to deliver peak BSFC in a cruise scenario. Put the engine in a full size truck however and you just might hit that point.
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