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I was making a comparison between what the cost of a Rotax is vs a more established, more powerful and more accepted engine.
Rotax is an established engine option. Also, the Rotax engine was engineered in the early 80's using modern metallurgy compared to Lycoming/Continentals. It has a proven history, good to excellent power output at a lower weight. Which results in an added benefit of not carrying extra weight which reduces performance. Fuel efficiency means not having to carry extra fuel which is extra weight.