Robert,
Thanks for reaching out and reading! (1) The noise is on par with other generators I’ve used. It’s not as quiet as an inverter generator to be clear. If noise is a concern that may be a better option. But if I’m running a generator then typically it’s because of a storm-induced power outage and my neighbors are probably running one too or fully understand the circumstances. Powermate had this to say about the noise rating: “We do not have a decibel rating. The noise level can be impacted by the environment. Such as the machine being on a concrete slab vs being on dry grass.” (2) The runtime is based off of the draw. Powermate lists 50% draw = 11 hrs total runtime and 25% draw = 14 hrs runtime. It’s an integrated function of the generator and doesn’t require the operator to change any settings or select an “eco mode.” (3) I have no clue and couldn’t find out. If you’re worried about EMI feedback in the line, you could always add a power conditioner to the line. Hope this helps. Again, thanks for reading! -Ben