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Big, brawny work trucks often find another purpose on American roads - hauling big, brawny Americans around. Toyota's latest gladiator to join the big-truck arena is the 2010 Tundra, and it's packing an all-new 4.6L V8. The big engine may not stand up to the likes of the 6.7L Cummins turbodiesel or 5.7L Hemi found in Chrysler's new Heavy Duty work trucks, but it still cranks out 310hp (231kW) and 327lb-ft of torque. Perhaps best of all, it manages 15mpg city and 20mpg highway thanks to the new mid-range displacement of the 4.6L V8. Folks looking for more grunt can opt for the 5.7L V8 already...