Without some known quantities, this is an irrelevant argument. Is a small generator better suited to run sub-3000w loads? Yeah, probably. Is it better to keep one in the bed of your hybrid truck instead of using the already equipped hybrid system? I would say absolutely not.
Single cylinder gas generators are very inefficient, a 6500 watt Generac branded unit I found at lowes burns 6.9 gallons in 10.5 hours at half load. ...4.95kwh/gallon converts to roughly 15% efficient.
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