You can tell exactly how much space will be lost - the spare will snugly fit in the spare wheel well along with the jack and tools. You are still left with all the space between the well and the false floor.Mii_boy said:I also don't have a spare wheel. Just one of those silly repair kits. Simply dreading having a puncture. I'd like to know how much boot space is lost by installing a space saver spare. Boot space is really important to my wife who uses it for weekly shopping. Thoughts?