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I fly a 421B. I can tell you it's no different from any other Cessna twin. It's amazingly similar to a 310. Get as much training time as possible in the real airplane. General Aviation sims are not very good. I have 35 years experience in airline sims and even those very expensive machines are not perfect.
Plan on 48 GPH as a realistic fuel flow. I've never met a 421 owner that flies lean of peak. I have seen as little as 42 GPH on my 421B but it was at reduced power settings and TAS of 185 at 14,000ft.
Try not to go above FL210. The turbos are working too hard and really heat things up in the engine. Also the 421 is a bit of a pig climbing and just takes forever to get there. The performance section of the POH is highly optomistic.
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