Aside from gas for the lawnmower and maybe fertilizer, what other day-to-day maintenance costs does a homeowner have a renter doesn't?

Cleaning products and lightbulbs are costs both renters and homeowners share.

I did forget replacing an asphalt laneway, just did mine, $2,500 for a 90ft laneway.

There's no way you can come up with $106k in maintenance costs that are specific to just homeowners.