I could also be remembering the results based on my usage.
Today, the comparison would be an electric rate of 24 cents (down from a few months ago, as the state reversed some public subsidies that were loaded into the electricity bills, but also reflecting my having locked in a lower supply rate before electricity prices went up) vs $4.60/gallon.
However, I do have hauling considerations – my wife has a rollator, so the need to accommodate that with luggage and/or visitors eliminates most sedans and hatchbacks; we have a Forester – and these days we’re relatively low mileage. (I think this will be the first year since pandemic that we exceed 10k miles…and we won’t exceed it by much).
The comparison supposedly factored in maintenance costs, the then-existent price differential for ICE vs EV, and differentials for insurance and tax/vehicle registration.
The cost of adding home charging capability was not included. (We only have 100amp service, and utilities are underground back to the street, so… I haven’t had the courage to look into costs.)
I have the distinct memory of the calculator suggesting that in CT there was no mileage at which an EV would make sense for me, BUT my memory could be flawed on that point, and I didn’t explore their cost assumptions (although I did calculate the total electric rate from a bill). The insurance cost differential is likely overstated, as I’m still in an employee affinity group for auto insurance from a prior employer.
(If we’re exploring the possibility of flawed memory…it’s possible that it might have been a comparison vs plug-in hybrid, but I doubt it.)
This is something I would have looked at post-pandemic, as pre-pandemic my driving patterns and available chargers rendered EV as unsuitable for my needs. (I commuted between Hartford and Montréal at least once a month; chargers in VT or the Adirondacks were too sparse for me to feel comfortable attempting that, when combined with a desire to minimize driving on the Isle of Montréal.)
EDIT: Maybe this was last year? I have a recollection that the calculator came up in the context of tax credits having gone away.