Over the last 4 years (700+ flights) I have used both Jet A and kerosene and have found no difference in engine teperatures or pump voltages during starts or while running/accelerating. Although Jet A for me is a lot cheaper I have been sticking with kero for my P-120's the last season or so because it does not smell near as bad as the Jet A, and the smell does not linger for weeks like Jet A does if spilled....ron