http://VacavilleGMC.com 866-593-1568 The foundation of Sierra's Never Say Never capability is its intelligent melding of power and performance. GMC Sierra offers the widest range of full-size pickup V8 gas engines - 4.8L, 5.3L, 6.0L Hybrid and 6.2L - with output that ranges from 302 to 403 HP. No competitor has better V8 fuel economy than the Sierra. Sierra XFE (Xtra Fuel Economy) offers an EPA-estimated 22 MPG highway and a 26-gallon tank to let you go up to 572 hwy miles between fill-ups.