If 1 gram of thorium is equivalent to 28,000 liters of gas and 8 grams of thorium is needed to power the car and the expected life of the ride is 1,000,000 miles isn't the MPG equivalent essentially the same as an Ecoboost 4wd F150 or about 17MPG?
Besides, from a fundamental perspective it is not MPG it is dollars per mile which matter.