# A Car & 20 Questions

- GOING FURTHER - Yet another characteristic quantity for automobiles comes from the fact burning a gallon of gasoline produces about 20 lbs. of carbon dioxide. [How can that be?] Consider now the following five characteristic quantities - average speed in mi/hr - average fuel efficiency in mi/gal - average fuel cost in \$/gal - average weight of fuel (specific gravity) in lb/gal - average weight of carbon dioxide produced per gallon of fuel burned in lb/gal How many additional distinct characteristic intensive quantities can you formulate? What are they? What are their values? To what question(s) is each of these additional quantities a potential answer?