First, gasoline has a little over 36,000 watt-hours of energy depending on the blend (36,650 to be exact). That number is a constant, it cannot change, to change it would be impossible, therefore, not everything is possible
only some things are possible.
Ok, so let's take my car for example, on a good day with lots of freeway driving my car can get 20 mpg. 1 gallon of gas has about 36,000 watt-hours of energy in it. 20 mpg means .05 gallons is used every mile, in energy terms that 1,800 watt-hours per mile. My car is a bit over 3000 pounds and has a drag coefficient of .36.
To get 200 mpg .005 gallons would be used in 1 mile. In .005 gallons of gas is 180 watt-hours, tiny bit to go very far
80 mpg for a fully ICE is near the max without complete overhaul like that shell car