You get completely different numbers if you go by overall cost / distance vs taxi pricing models. In the latter, you separate out the flag drop fee (~$10 for Waymo) from the mileage and time process. Here's an experimental Waymo price tracker trying to estimate these numbers:
$2 is a good target for the AV mileage rate. It's actually somewhat high if I put my industry hat on for a second. It's not a good estimate for the number you'll get from doing total_price/distance.
That’s surprising. I’ve been trying to find data on rates and crowd-sourced data and anecdotes seem closer to $6/mile