How is 210 MPG Price Equivalent possible?

By a more efficient vehicle, cheaper fuel and simple math. You see, if the American Roadster was running on regular gasoline it would be getting an incredible 70 MPG: three wheels and a smaller engine means less friction and less weight, while clean burning CNG means few smog controls. Because natural gas is domestic (meaning it dominantly comes from the USA), because it requires little refining (so it cuts down the cost of processing), and because it is transported to fueling stations and homes through pipelines rather than trucks, it is a lot less expensive than gasoline. To be exact, while a gallon of gasoline may cost from $3.00-$4.00 per gallon, an equivalent amount of natural gas (GGE) can be purchased in Utah (state wide) for only $0.87 cents. With these statistics in mind compressed natural gas (CNG) is over 3 times cheaper. So when you multiply the car's 70 MPG x 3 = 210 MPG Price Equivalent. (Actually, given the current average Utah gasoline price of $3.149 per gallon and a CNG price of $0.87 per GGE, the true price equivalent is 253 MPG.) This means that for less than $5, you can fill up the Roadster's tank and drive over 400 miles before fueling again.