Personally I don't know why. I have read they run hotter.Does the engine run less rpm? Less torq? Not understanding that one.
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I just know all tri-fuel generators have different ratings for different gases. I reached out to Century Fuel Products (they make a lot of conversion kits) and they replied with:
Propane is a 2-5% reduction from gasoline rating.
Natural Gas is a 15-18% reduction from gasoline rating.