👉Paying $15 a "Gallon" at a DC Fast Charger. 37lbs of Coal burned.

If I charged at home it would have cost $3.31. Still higher that the current price of a gallon of gas :)
37lbs of coal was burned to produce this amount of electricity.

How much coal, natural gas, or petroleum is used to generate a kilowatthour of electricity?
The annual average amounts of coal, natural gas, and petroleum fuels used to generate a kilowatthour (kWh) of electricity by U.S. electric utilities and independent power producers in 2021 were:
Coal–1.12 pounds/kWh
Natural gas–7.36 cubic feet/kWh
Petroleum liquids–0.08 gallons/kWh
Petroleum coke–0.82 pounds/kWh
The annual average number of kWh generated per amount of coal, natural gas, and petroleum fuels consumed for electricity generation by U.S. electric utilities and independent power producers in 2021 were:
Coal–0.89 kWh/pound
Natural gas–0.14 kWh/cubic foot
Petroleum liquids–12.69 kWh/gallon
Petroleum coke–1.21 kWh/pound
https://www.eia.gov/tools/faqs/faq.php?id=667&t=2#:~:text=Coal%E2%80%931.12%20pounds%2FkWh,Petroleum%20liquids%E2%80%930.08%20gallons%2FkWh