The 1991 Ford F-150 continued to offer buyers a wide variety of trims and configurations. Trims available for the 91 Ford F150 were the XL, XLT, and XLT Lariat; configurations included extended-cab supercab and standard cab in 2-door and 4-door setups, and a choice between long-bed and short-bed models. Once again, the 1991 Ford F150 dominated the US market. This rugged pickup had the reliability and versatility for a range of farm and ranch uses. The four-wheel-drive options, including automatic locking hubs, made it a favorite of off-road adventurers as well. The 91 Ford F-150 is a solid, durable choice for project lovers, tuners, or anyone looking for a classic muscle truck. You'll find plenty of power under the hood, with fuel-injected engines ranging from a 4.9 liter, 150-horsepower straight-six to a 5.0 liter Windsor V-8 to an International Harvester Diesel V8 putting out 185 horsepower. All that power comes at a price, though; the 91 F150's gas mileage isn't anything to write home about, with an estimate of 17 mpg on the highway, 15 mpg in the city.