[GASWAGON]

I personally cannot see it working it is just a 'concept design' isn't it?......Surely you will get some leakdown of fuel contaminating the engine oil?
You are much more likely to get improved power and economy from things like variable camshaft timing, variable compression and bi fuel/tri fuel designs.....Eventually they will even have electronic or air solenoid operated valves with no need for camshafts and valve train gear that suck power from the engine.

I really think the EcoBoost 1.0 and V6 TT are leap years ahead of the rest while still burning petrol/diesel with fantastic power and economy figures!