It is my understanding that the aero wheel has a 10% percent difference in range. However, it is not clear if that is on top of the 220/310 range listed on the car. So, does anyone know if you take the aerowheel caps off, do you then get 10% less range (so about 200/280 miles), OR do the aero wheel covers give you a 10% boost on top of the listed range? Also, what is the range with the larger wheels? I am trying to decide what wheels to get, but I am not sure that I want to pay an extra $1500 for the nicer looking wheels, if I end losing range. The smaller wheels also look great without the aerocover on, so if the range is 220 WITHOUT the covers, it makes the decision simpler.