A Mooney M20J is a 145-150 kt KTAS aircraft only if you typically run 55-60% power (8000', econony cruise power, 8.6-9.2 gph respectively, BTW), but if you run truly "typical" power settings a M20J is considerably faster than 145-150 kts. For example, an M20J will produce ~169 kts @ 75% power @...