I have no ability to make real life comparisons, but I find it hard to believe that the newer designed run flats could be that worse than the M3 OEM tires when you are at 44 psi (or was it 42) tire pressure. With pressure that high, I would say my wife's BMW run flats at 33 psi -Fr /3 6 psi -Reari are swishy compared to the M3. The differences in tire specs are: the Bridgestone drive guard vsTesla MXM4 is 5 lbs heavier 30 vs 25 lbs (watch out for pot holes), thinner tread 6.6 vs 7.5" and depth 9/32 vs 11/32. I wonder if the rolling resistance is similar since it is thiner but then again thicker tread increases rolling resistance until it wears. BTW, the run flats at tire rack is cheaper than the OEM replacements for Tesla.