NHTSA Complaint #11561633 — 2023 TOYOTA TUNDRA

When I drive the vehicle for a period of time and use a 1/3 of the fuel in the vehicle and park on non level surface: Meaning the front of the vehicle is pointed up and rear is lower the fuel gauge will register full on vehicle restart. Even if I drive the vehicle around and park it on a level surface and restart the vehicle it still fails to show the correct amount of fuel in the vehicle. In addition it will slowly subtract fuel based upon driving that is inline with normal fuel usage: It never registers that you are actually 1/3 lower then indicated on the gas gauge. I have identify two ways to address the issue of the gauge not registering the correct amount of fuel in the tank: 1) Refill the truck with maximum amount of fuel 2) Disconnect the negative battery terminal, let the truck sit for 30 seconds, and then reconnect the negative battery terminal. It will then register the correct amount of fuel in the truck The safety concern is I could run out of gas in unsafe manner on the road.