I have more spares than I have cars, I average between 300 to 400 miles a week, most of my driving is in open country so my goal is to always carry a good spare.
I have been known to dispose of space savers and replace them with a same size. What I think of space savers is not fit for print, they are OK,
I just happen to have personal biases… 
If you live in the city and most of your driving takes place in city/ urban areas you could problay get by without carrying a spare by getting a membership to triple AAA to tow you to the nearest tire shop, or maybe home?
But from what I have seen of some of Nevada’s desolate roads I sure as hell wouldn’t drive out of the city limits without one