Skoda have released an updated owners manual, dated 11.09 (old one 05.09). appears now to include all engines.

There also appears to be some additional/changes to information previously published, such as tow limits and CO2 (reflect 2nd generation CR engine, thanks JonA) and bizarrely snow chain info, although that bit I cannot make sense of.

http://new.skoda-auto.com/com/service/documentation/yeti/Pages/0509.aspx

Thanks Plumber, the fuel consumption figures now some sense:

On Highway cycle, all the diesel engines in 4WD are now equal - logical. In the urban cycle, the 103 kW is more economical than either the 125 and the 81 kW, but differences are small - <0.4 l/100 km:.2WD 81 kW uses around 10% less that 4WD.

Conclude: For 4WD, pick your engine on price and desired performance, the fuel consumption differences are minimal.

One curiosity: the fuel consumption for the Yeti with 125 kW diesel is lower than the Octy and Superb with the same engine. It must be a measurement freak on the dyno test, which does not take air resistance into consideration. As the Yeti both has a higher cv than either of the other two AND a larger frontal area, it ought to be the other way around.

I have not been able to find the EU 99/100 directive for the testing procedure, so if anybody knows where to find this, I would appreciate a tip.

Try

http://www.internationaltransportforum.org/europe/ecmt/cm/pdf/CM200310e.pdf

This gives a number of EC directives in the Appendix.

One curiosity: the fuel consumption for the Yeti with 125 kW diesel is lower than the Octy and Superb with the same engine. It must be a measurement freak on the dyno test, which does not take air resistance into consideration. As the Yeti both has a higher cv than either of the other two AND a larger frontal area, it ought to be the other way around.

Could be down to different gear ratios.