Just the opposite of GP's opinion, I think basing the statistics solely on Telsa will half the figure rather than doubling it. Suppose the average interval of accident is t and the average speed of car is v, as Telsa cars only represent a small portion of all vehicles, we have

    - Only Telsa: distance_travelled / num_accidents = v t / 1
    - Two cars involved, but counted as one accident : distance_travelled / num_accidents = 2 v t / 1