this is a good read from another website that explains that we have a "float" that measures our tanks. Take a look (hey it even has pix )
Toyota Tundra Fuel Guage Inaccuracy | tundraheadquarters.com

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07 Tundra DC 4x4, Radiant Red, debadged, Bed Mat, Brushed stainless steel step boards, Auto Dimming Rear View Mirror, Heated Towing Mirrors, 18” Alloy Wheels, Cold Kit, Mud Flaps, Tow Package, Rear Sliding Window, All Weather Floor Mats, TomTom 920T