As I said I can't say I have ever noticed a difference personally. I have no reason to doubt you noticing a difference. There would be some loss if the oil pressure increased as it would take more to push a higher pressure however the question is how much? Oils can lose some viscosity if they are pushed hard enough. I have experienced higher oil consumption and minor leaks when changing between brands however that returns to normal after the new oil has had a period to run in. Maybe see how if feels with a few more KM's on the oil.