Make sure to turn off the fuel and let it run dry whenever you use it. All my small engine fuel gets treated with Seafoam soon as I get home. It's good as a stabilizer for two years and keeps engines clean. It also prevents phase separation, specially now that even premium has ethanol in it. I also cut up a long length of fuel line so I can drain the tank and not have to bother running it for maintenance. Mine is only 3200K 110V so it's easy enough to lift up on some cinder blocks to drain. I also have it grounded to a copper pipe pounded into the ground. A lot of people don't bother but there's a good reason those ground posts are on the unit. As for extension cords, I made up a 6ft heavy duty male to male cord and I back feed one side of the panel through the outdoor plug after first disconnecting from the grid, you have to isolate your home. Luckily my well pump is 110V. and on the same side of the panel is my propane furnace, propane hot water and many of the downstairs plugs including 2 freezers and an all fridge. Plus some upstairs plugs and lights. I have a wood stove upstairs. That cord never even gets warm so I have zero issues using it that way. That genny had been sitting in my back shed brand new never opened box for 5 years or more when I saw it on sale for 40% and needed a new one anyway. It actually didn't click in till after visiting a neighbour the day after the storm that I had one in the shed lol. So that was that May storm '22, since then I've used it twice for a total of 40 hours tops. I know all the circuits to leave on, I have a paper list I made back then right at the panel.
So, total cost to power enough of my home off grid to still take a hot shower, have some lights, house lights are all all LED's, watch tv, use my LPG range for cooking like normal? It was $350 I think when I grabbed that deal way back. No pony panels and expensive connectors, switches and cables. It's easy to make the patch cord, just need an extra male connector. If I was to lose power here I could hang in quite well on a smaller mid size genny.
Cheers