The Aztec has found a new home - it provided me with eleven years of good cross country airways service, but as someone kindly pointed out in the thread it is more aircraft than my current needs.
If you need a de-iced twin that will carry 5 to 6 in comfort, 600nm with IFR reserves they remain a good option - maintenance OK, and today they will all be on a proper schedule to get the ARC.
150KTAS on 75~80 litres is typical airways cruise with 1000 lbs of payload - not economical, but not quite dinosaur territory - perhaps should be thought of as a poor man's KA!