Originally Posted by
wizepilot
I flight plan the 421 generally at 205 kts. Upper teens to low 20's. Anything above that you're pushing it. My boss, who at 83 still actively flies the 421, among other aircraft, has 20,000 hrs in the 421. He probably knows more about the airplane than anyone else in the country. He can get that fuel burn down around 38gph, carefully. Safe to flight plan at 40gph, 50gph to be conservative.
That's a whole lotta 421 time.