3.3L V6 SMPI SOHC. All the right ingredients! Estimated 18 MPG! If you want an amazing deal on an amazing truck that will not break your pocket book, then take a look at this gas-saving 2001 Nissan Frontier. This Frontier will save you cash at the pumps with its fuel efficient 3.3L powerplant. This truck is set up to be a tow vehicle also.