Cozy, Long ezy, and diesel engine.

Please excuse my ignorance, but I've been reading a lot of hoopla over 2
stroke diesel aircraft engines. Has anybody tried one of these in a Cozy or
Long Ezy? It sounds to me like that may make for a very fuel efficient
aircraft with good performance. Any reason why it can't be done?

If the aircraft is home built, could it burn standard diesel even though it
hasn't been approved by the FAA? Is there a good reason not to use standard
diesel other than fuel congealing at cold temperatures?

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