Emgen is just a trade shorthand for emergency generator. And yes, using propane fuel on an equivalent generator will yield a lower KW capacity since it isn’t as efficient combustion fuel as gasoline.Is an Emgen one of the permanently-installed generators? I'm looking at the portables (assuming that 60 lbs is portable for folks in their 70's.) The figures I've seen on dual-fuel do list higher figures for gasoline than propane, if that's what you mean. I'm going with those figures (the lower ones.)
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