Tesla may be using the 220/310 mile range figure (and .23 Cd) as a lower bound for cars equipped with the 19" Sport wheels/tires. If that's the case, I wouldn't be surprised if the range with the 18" Aero wheels/tires (I'm assuming the tires also have a smidge lower Crr) is over 215/320 miles. It may be that Tesla hit their design goal of .21 Cd with the aero wheels. I know other manufacturers have used conservative estimates for early production cars. DW's first gen plug-in Prius initially had the same mpg rating as the hatch. INL testing and anecdotes pointed to the car getting better mileage on gas, and sure enough, Toyota bumped up the PiP's mpg rating after a couple years. If they're as good as Chgd Up's wheel covers, and Motortrend's highway rating is correct, a long range 3 with Aero wheels might be able to do 330+ miles on the highway. Since I'm being super-speculative, if everything I've already posted turns out to be accurate, driving 100-150 feet behind a semi in said 3 might net 400+ miles of highway range. Aero wheels Of course, YR(ange)MV.