So, I spent some time calculating things. It's not exactly completely comparable due to differences in use and some EPA estimations. But it gives an overall picture.
Gas price: $3.55/Gal. Price has come down since.
Electricity price: $0.146/Kwh. Including delivery, taxes, fees and everything else that is per kwh Price recently went up.
Wall Charging(on the charger every time it's parked at home, even few minutes) test: 860 miles, 11.85 gallons of gas, 282 KWh. Average speed was 29.5mph. This comes to $0.0968/mile
Hybrid only(no plugging in) test: 298.6 miles, 11.46 gallons of gas(25.9mpg), 0 KWh. Average speed was 24.1mph. This comes to $0.1371/mile. This test was a lot less highway driving which I would expect to lower cost slightly. Interestingly, van gives you miles while engine is on, the rest is EV miles(even when regen) the split was 61%Gas/39%EV on this test.
For reference, EPA numbers
Gas only Pacifica: 22 mpg, $0.161/mile(the way I drive, I would expect that number to be lower for my use... Say 19mpg - $0.187/mile
Sienna Hybrid(No plug): 36mpg, $0.986/mile
Tesla Model X(ok, they are not in the same category, but it is the closest thing Tesla makes to a minivan): 0.32KWh/mile, $0.0467
VW Buzz(I can't find real numbers, but taking range/batt capacity at its face): about the same as Tesla(0.30-0.35kwh/mile) depending on configuration
Taking Gas Pacifica 22mpg as a base and using mostly EPA numbers, Sienna and my Pacifica(using plug) would save(assuming prices remain same- right) around $6200 over 100,000 miles. Tesla - $11,400
Is any of it worth it? Largely depends on use cases and priorities in my opinion.