The 2013 Toyota Tundra hasn't kept up with other full-size pickups in fuel-efficiency, and it's enough to matter if you're cross-shopping them all and care about mileage numbers.
It's Toyota's V-6 model lags the most; its big V-8 versions are at least competitive with Ford, Chevy, GMC and Ram trucks, but with the 2013 Ram 1500 reaching up to 25 mpg highway with its new eight-speed automatic, the Tundra V-6's 16-mpg city, 20 highway ratings are far enough behind to leave a dent in your fuel budget.
The Tundra offers a choice of V-8s, with decent fuel economy for the class. The mass-market Tundra, with a 4.6-liter V-8, an automatic transmission and rear-wheel drive, checks in at 15/20 mpg, according to the EPA. Topping it off with four-wheel drive lowers those figures to 14/19 mpg.
If you opt for the most powerful Tundra with the 5.7-liter V-8, you'll see 14/18 mpg at best--that's with a 4x2 drivetrain. As a 4x4, this Tundra manages just 13/17 mpg.
Hybrid models aren't in the near-term plan for Toyota; neither are more economical diesels.