How true, Bob. Here are two quotes from the Fuel Management page in my
www.SkymasterUS.com website:
You see, because of its reputation as a bullet-proof aircraft, some pilots treat the 337 as if it was a simple single-engine aircraft. But it isn't. You don't just get in and fly. If you treat it for what it is -- a complex, high-performance, retractable-gear, variable-pitch-prop twin -- and if you maintain it properly, and if you do thorough pre-flights, and if you stay proficient, then it is indeed a very safe aircraft.
You start with a thorough pre-flight as set forth in the Pilot's Operating Handbook (POH), including climbing on the wings to visually check fuel quantity on each tank, draining fuel from each tank until it's water-free (and remember that you do these two tasks after each re-fueling, not just before the day's first flight), draining the engine fuel sumps, and confirming that there's adequate oil. Nothing new here, just the old routine stuff, except it's important -- the Skymaster is not bullet-proof.
Ernie