Cathy Saxton (Tom's wife) did some tracking during our last group drive. We had 8 Tesla Roadsters make the trip to the wind farm. We all met at a coffee shop, gave Cathy our ideal miles, wh/mi, etc. There were all three versions of the Tesla Roadster represented in the group of eight. First model year, second model year and my Tesla Sport.
At the various checkpoints (highway rest step, Wind farm for recharging, return highway rest stop) we all gave updated numbers to Cathy.
The final report from Cathy showed practically identical efficiency for all three models of the Tesla Roadster. The variations were minor. I think total driving for the day was over 200 miles for everyone. They are all so close that the differences could be explained by driving style. My sport was not the worst in efficiency for the group of eight. It was not the best either. I think it was right in the middle. But the top and bottom were not far apart. Remarkably consistent.