Three questions: 1) How much would 8g of Thorium cost? How much would the engine cost? Even with economies of scale, I can't imagine that it won't be an astron

Three questions: 1) How much would 8g of Thorium cost? How much would the engine cost? Even with economies of scale, I can't imagine that it won't be an astronomical investment. 2) Could enough thorium ever be produced? Can it work on a North American ~1car/person scale? 3) Finally, is this _really_ a good use of the technology? Isn't it better to just drive less, use public/bike/walking for transportation, live closer to work, etc?