The website for the data of the study is rather thin on methodology. I would not trust any study on this topic without first knowing things like how they calculate the cost per mile and/or the cost per Kwh.
For example, why does the “Fueling cost per 100 purposeful miles” vary so widely for EVs?
I don’t own an EV but I can’t imagine it cost $12+ to fuel up at home for “100 purposeful miles” based on the typical Kwh cost for home electricity. That would mean that it would cost you nearly $40 or each time you fully charge a vehicle with a 300 mile range.
For those with an EV, does that mirror your experience?