The cost of driving is more than the cost of fuel alone. You also need to include wear and tear on the vehicle, the cost of insurance, and of course the cost of putting that CO2 in the environment, which is currently not a part of the price of gas.
The cost of driving is closer to $0.50/mile:
https://www.irs.gov/uac/newsroom/2016-standard-mileage-rates...