Trimurtisan
Flying by the seat of my pants!
OP, please take the above advice.Sorry - needed to jump in for safety reason. I'm a former EMT. - PLEASE do not use the generator in the garage. It is a recipe for carbon monoxide poisoning! Even with the garage door open, CO can get in the house. Generators need to be outside.
Your drywall will not stop the the gas from entering your house. I live in FL and have been through every hurricane since '91. Rule number 1 with generators is they need to be outside of the house, including the garage. If you have a detached shed that would be best. We've even used a dog crate with a tarp covering it before. Anything to get it out of the house is a better idea.
I wish you the best of luck. It passed this area with minimal stress, hopefully you get the same. Stay safe.