Likewise, I’m a little disappointed in the range hit. I didn’t fully realize that reducing the “face” surface area of the wheel has the largest impact on range. My 30k mile average is 329 kw/mi. For the first 800 miles it’s been 360 kw/mi. Granted, I installed these mid December so that doesn’t give an accurate “year round” average. Still worth it though.
if there were after market aero-caps that would clip on to them for road trips I’d buy them!
It may also be due to the higher rolling resistance of the A/S 3+ vs. the stock touring tires. I also put my tires on as the mercury dipped (late October) so it's difficult to get a 1:1 comparison. The initial 1,000 miles of any tire are also less efficient.
I'm not sure if it's specifically the "face" of the wheels. I have no way of measuring that, but I have a fair amount of spokes and I still have the range hit. My previous wheels were 19" cyclones. Our wheels are now closer to the fenders which may also affect aero slightly.
I'd be interested to hear experiences on range from those who have gone from MXM4s (or your Goodyears) to A/S 3+ on the same wheels.