Larry,
Here's my 2 cents ... I didn't think it was a question of more horsepower, but rather the service ceiling is kind of low on the diesels. It's limited to something like 12,000 feet. This is apparently related to the ability to restart at diesel at altitude (don't know if it's temperature or pressure issue). I think they are researching some techniques that might allow an increased ceiling, which would make the conversion more attractive.
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