Per zxcvbob:
I wonder if I could run it *inside* my detached garage to keep it out of
the weather and keep it from "walking off", and use some kind of powered
exhaust vent...

How detached is "detached".

I'd be worried to the fringes of paranoia about carbon monoxide.

As far as the gennie goes, I've run mine in my garden shed (about
75' from the house) with no problems. OTOH, a garage is a lot
nicer/cleaner environment to begin with and smell/exhaust fumes
settling on things might be an issue. But as far as the
generator being able to breathe goes, the garden shed seems tb
ok. Roof line vent, couple jalousie windows, about 6 x 10 feet
floor space.
--
PeteCresswell