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Troy Anderson was at a gas pump in Salt Lake City and couldn't have been happier, filling up at a rate of $5 per tank. Anderson was paying the equivalent of 63.8 cents a gallon for compressed natural gas(CNG, making Utah a hot market for vehicles that run on the fuel. It's the country's cheapest rate for compressed gas, according to the Natural Gas Vehicle Coalition, and far less than the $3.60 or so national average price for a gallon of gasoline. I'm totally celebrating," crowed Anderson, a social worker, who picked up a used Honda Civic GX earlier this year. "This is the greatest thing. I can't believe more people aren't talking about it. This is practically free." Personal ownership of natural-gas-fueled vehicles in Utah has soared from practically nothing a few years ago to an estimated 5,000 autos today, overwhelming a growing refueling network, where compressors sometimes can't maintain enough pressure to fill tanks for every customer.