Toyota's 2010 Tundra debuted at the Chicago Auto Show with minor styling upgrades, a new engine and new trim packages.

Toyota's Tundra full-size pickup showed in Chicago with minor updates for 2010, including styling updates and a more efficient 4.6 liter V8 engine.

The new 4.6 V8 makes 310 horsepower and 327 ft-lb torque, and preliminary fuel economy estimates have it rated at 15/20, according to Toyota. A six-speed automatic transmission is standard equipment.

The Tundra's styling has been tweaked slightly, with new grille and headlamp treatments as well as minor modifications designed to improve its worksite-friendliness. Two new trim packages join the lineup: the top-of-the-line Platinum Package, and the no-frills Work Truck Package. The Platinum Package stands out with chrome bumpers and a billet-style grille, as well as unique 20-inch wheels and special badges. Inside, this luxury pickup gets special trim, perforated leather upholstery, a navigation system, a sunroof and a wood shifter knob, among other high-class appointments. The Platinum Package stickers for $5140 and will enable the Tundra to compete with the luxury trucks from Ford and GMC.

At the opposite end of the spectrum, there's the Work Truck, which is stripped down for ease of purchasing and upgrading by contractors and fleet operators. The Work Truck gets standard black plastic trim, manual windows and a hose-out vinyl interior. Keyless entry and cruise control are removed from the standard package as well, which lowers the MSRP. The Work Truck package will sticker for $550 to $655 less than the base Tundra.

Gallery: 2010 Toyota Tundra Unveiled with all-new 4.6-liter V8 engine