After having a flat this weekend some 450 kms away from my house... I was lucky to have this space saver tire in my trunk. I will tell you it was kind of scary driving on one rear 3 inch wide tire and a 8.5 inch tire on the other side. Car had the shakes at speed. And it was pure "hell" being limited to driving at "only 80 kph on a German Autobahn!
I think I will buy a full size spare now. Maybe a 17"x7 alloy with a 205/55HR17 mounted on it. Something cheap that will fit in my trunk.