Why would you buy a fuel-efficient car?

USA cars today, on average, seem to be less fuel efficient than 20 years ago. Many environmentalists feel that people will buy gas guzzlers as fast as the manufacturers can make them. The only hope for fuel economy is to force the automakers to make more efficient cars. Well I’d like to float one idea: Would you consider buying a car that could go 750 miles between gas refills? Think of all the time you’d spend away from gas stations, and all the trips you cold take without refueling at some horribly pricey place.
In any given year, cars tend to all have similar cruisings distance regardless of efficiency. In the 1960’s and early 70’s, a tank generally held 200 to 250 miles worth of gas; now it’s 300 to 400. But imagine a car with a 16 gallon tank that gets 50 mpg! That’s 800 miles in one tank, and that freedom might sell a lot of cars.