MPG: 31/39; Base Price $12,995. The Nissan Versa sedan is the cheapest new car sold in the U.S., but you’ll have a hard time finding that $13K spartanly equipped version on a given dealer’s lot. It gets its top mileage with the available CVT automatic transmission, which is unavailable on the base model with the five-speed manual (that version is rated at 27/36 mpg).