[sk03]

I believe this question may have been asked before but couldn't find the thread so please feel free to point to relevant thread.
My x50e has 20 inch Pirelli run flats and obviously no spare. The car was bought for long trips and it makes me uncomfortable thinking that a limited run flat may be of little use if a tire takes a puncture.

I'd like to know what others have done. Since there is no space to hold even a donut, I'm thinking that a full size may be better choice. Any suggestions for wheel and tire mix without spending a lot ?