Daniel in SD
(supervised)
It weighs about 40lbs so it increases the weight by 1% but doesn't affect aerodynamics so my wild guess is 0.5%. The problem is when I want the spare most is when I'm on road trips. If I'm in town I can just Uber home and get a spare or try to get a friend to deliver one to me.How much range do you think people would lose carrying a spare tire? I bet 99% of the time, no one keeps stuff in their trunk that couldn't be placed elsewhere.