The F-150 has been a top seller for Ford over its lifetime, at times even being the most popular vehicle in the country. And while the truck is currently the best-selling pickup truck in the U.S., that doesn't mean that the automaker thinks there aren't improvements that could be made.

Ford has announced that the 2011 F-150 will come with two new engine option for drivers who don't need all the power that a V-8 provides. The 3.7-liter V6 will be the new base engine for the truck, and Ford says that preliminary tests have revealed the truck gets 23 mpg on the highway and 16 in the city. The automaker also plans to introduce a slightly more expensive 3.5-liter EcoBoost V6, which will increase fuel efficiency even further.

The new V6 engines are somewhat risky for Ford, as those who buy full-size trucks typically opt for high powered V8s. While Ford will still offer those engines on the F-150, it will offer one less V8 and heavily market the V6.

"Fuel economy is the number one unmet need in the segment," Doug Scott, Ford's truck marketing manager, told the Detroit Free Press. "You are talking about a 20 percent fuel economy improvement, and at the same time we are giving them better performance."

Buyers looking for a used Ford F-150 will have no shortage of options, as the truck is consistently popular among drivers.