Costco currently has the Generac XT8000EFI on sale for $200 off. This is a gasoline only engine with a starting wattage of 10k and a running wattage of 8k. It features electronic fuel injection, so not carburetor to get gummed up from gasoline sitting in it too long. Although not an inverter, it does feature automatic voltage regulation to provide clean power for electronics. I'm considering upgrading my 15 year old Troy-Bilt 5500w to be better prepared from hurricane season. The manufacture rebate is good from 05/31 to 06/07. This thing weighs over 200lbs, so the free shipping is a plus.