Bought a new Yamaha generator . . . have some questions that I figure you folks might know the answer to . . . 1. It has a ground earth terminal. Am I supposed to hook this up to something or am I good to go with the generator as is? 2. There is a voltage adjustor . . . do I need to fiddle around with this . . . and when would someone do so? 3. There is an economy switch where the generator kicks back to half speed and power output . . . I assume this is to run light use electrics such as lights, but not the freezer, refrigerator, well pump, etc.? 4. I'm running ethanol free fuel in it for now . . . for long term storage the manufacturer recommends running it dry and shutting off the fuel. Is using fuel stabilizer also fine? Preferences?