[Ask HN] what would the mileage of the Tesla be?

I've seen many pictures like this in the recent past and thought. http://teslarumors.com/News-2012-02-25-013.html "What if they just added a steering wheel to that?" How much would the mileage/efficiency increase? If the body/seats and all the misc... were removed and it was used as pure transportation scooter traveling at a reasonable speed, how far will it go? 2x, 4x, 10x? Would love to hear from anyone that has a guess. Thanks!