However, any difference in speed for a given fuel flow can’t be accounted for by internal construction. If, as has been said, the plane is lighter, then it will go faster. Not much faster (because at typical GA speeds most of the drag is parasitic, not induced) but a little bit.
I am not surprised if the rubber mouldings stuck to a propeller (whether for heating or for TKS fluid channelling) cost some performance.
After inquiring directly with MT, it appears the clean blades deicing system never made it beyond prototyping.
