Tesla has put an interactive calculator on the Model S page that allows you to play with differences in speed, air conditioning, and wheel size and their effect on range. I hope that they will put a similar calculator on the Model 3 page in the near future. Realize that calculations for the MS may not extrapolate exactly to the T3 but it does give a clue for what we might expect from the T3. Go to the MS page and play with the variables yourself, it is very interesting! Increasing the speed on the MS from 60mph to 70mph reduces range by ~17%. I would think that increasing speed from 65mph to 75mph would have an even larger impact on range. If one maintains every other variable constant, turning on the a/c at 90F out side temperature as compared to leaving the a/c off at 70F outside temperature, decreases range by ~4%. Turning on the heat at a lower outside temperature has an even greater impact on range. Increasing the wheel size from 19" to 21" while other variables remain constant decreases range by ~2% Increasing all, speed from 60mph to 70mph, turning on the a/c when outside temperature is 90F, and increasing wheel size from 19" to 21" has a COMBINED decrease in range of ~23%! For comparison,I expect that driving my Model 3 at 65mph, with the a/c on at 90F outside temperature, and using the aero wheel covers on 18" wheels will give me a MINIMUM of 15% to 20% better range than someone driving 75mph, with the a/c on at 90F outside temperature, with the 19" sport wheels. YMMV.