doesnt matter. if they were going slow then the tesla aeros also arent as good. What matters which one is better. one could argue that at higher speeds turbulence might be more prominent with the orbital ones which may lower their efficiency slightly compared to a lower speed test.
It matters if there are more starts and stops at lower speeds, which tends to be more common. Then it comes down to how well you keep acceleration/deceleration constant between the two runs.