Tick through the list of engines available for Toyota’s Tundra full-size pickup and you’ll note they come in three sizes: 5.7-, 4.6-, and 4.0-liters, all gas-fired. But that’s not for long, according to WardsAuto. Come 2016, the option list for the next-gen Tundra will include a Cummins 5.0-liter turbo diesel. That oil-burner is predicted to [...]