well a space saver is rated to 80km an hour, and they are to be used to drive to get your tyre fixed (ie: the nearest repairer)

so, I wouldn't if i was you..

Altho, saying that, I have seen cars doing 100km an hour down the freeway with a space saver on, I saw one car for two straight weeks running around with the space saver on...

I recon you are an idiot if you try it tho, and if/when it go's ass up, I wouldn't expect anyone to help you...