Approximate cost per mile summary
-Summary: In about 10,000 miles, with a mix of home charging and high speed charting, my cost per mile of 'fuel' is about 56% of the average ICE cost per mile.
Cost of 10.02 cents per mile for 'fuel' vs. ICE cost of 17.99 cents per mile for gas. This is based on actual cost and $4.09 per gallon gas according to a search; though it looks like average price of gas today in NY is $3.89. Cost would have been lower if I had not done as much high speed charging.
Detail
Odometer: 9,836 miles;
Approximate cost to charge: $985.58
-Home and handful of Chargepoint slow charges): $566 (Chargepoint app)
-Highspeed Shell Recharge sessions: $366.88
-Highspeed EA sessions: $52.70
Notes:
0-If you compare the Rivian to an AWD Durango, the savings are even better. The google machine says an awd 2021 durango costs $6.49 for 25 miles, or 25.96 cents per mile [fueleconomy.gov]. (649 cents divided by 25). The Rivian's fuel cost is 38% of the cost of a Durango's fuel. (For the record, I still think that is a ridiculously generous comparison by the Rivian given its storage and size).
1-I did not specifically tally energy total, but home was 57% of cost. If I had to guess, I would say home is 75-85% of actual mileage;
This supports the conclusion that home charging is much cheaper than high speed charging. To get a sense of how little I need to high speed charge on Long Island, I can only recall two high speed charges on Long Island: one in September when we were coming back from Montauk when we were stopping for lunch in Riverhead. I probably didn't need to charge, but I wanted to try that charger to see how it was.
2-I took cost of gas cars per mile from a few google search. Since I am comparing a big, inefficient SUV (compared to say most teslas) to a general price for ICE, this probably understates the savings.
3- This is not conservative driving. Most of it is in 'sport' or 'All purpose', both of which are 4wd, with too many 'launches' too count. If anyone is in the car for the first time and they want a launch, I do it. The only time i have been in conserve mode are are few of the ski trips when I was trying to figure out if I would make it to chargers in real world driving.