includes as standard: an electronic automatic limited-slip differential (Auto LSD), Vehicle Stability Control, traction control, electronic brakeforce distribution, brake assist, anti-lock brakes, and tailgate assist. However, its starting price was more expensive than the Chevrolet Silverado Work Truck and Ford F-150 XL. Some other changes Toyota included in the new Tundra are optional tow mirrors, a fuel tank, available alloy wheels, backup camera, Bluetooth, large center console (big enough to fit a laptop), extra-large disc brakes and calipers, and the aforementioned 6-speed sequential automatic transmission. All 5.7 L Tundras come equipped with a tow package which includes engine oil and transmission coolers, an integrated trailer hitch, 4.30:1 axle ratio, and large braking hardware for increased fade resistance. Equipped with the 5.7 L V8 the Tundra has a maximum tow rating of depending on body configuration. Toyota began rating the Tundra under the SAE J2807 protocol beginning in 2010. Model year changes The 2008 model added 13 variations bringing the total to 44 model variants. The 2008 models feature additional standard features at a lower price, also include a new "Tundra Grade" trim which is slotted below the SR5 trim, and geared toward trades people and the price conscious consumer. Toyota made E85 fuel capability standard to 2009 Tundra's equipped with the 5.7 L V8 in select regions. Toyota also updated the TRD Sport package and added a TRD Rock Warrior package. Prices increased 0.4% over the previous 2008 model year. The 2010 model year Tundra received visual updates to the grille and tail lamps. A premium Platinum trim level was added. A new 4.6 L V8 paired with a 6-speed automatic replaced the previous 4.7 L 2UZ-FE V8 engine. For added safety, driver and front passenger knee airbags became standard and NHTSA frontal crash test scores improved to five stars. The 2010 Tundra began arriving at dealers in late April 2009. Special editions and option packages Ivan Ironman Stewart Signature Series Tundra In June 2008, Toyota introduced the Ivan "Ironman" Stewart Signature Series Tundra. Three different packages are offered, one of which includes the TRD Supercharger. As of 2008, Stewart has won the Baja 500 seventeen times driving Toyota vehicles. Rock Warrior Package For the 2009 model year, Toyota introduced a new off-road themed option package called the TRD Rock Warrior. This option package was only available on the 4x4 Tundras with either the Double Cab or the CrewMax cab.