My SUV is 4500 lbs and has a 17 gallon tank. Gasoline weighs ~6lbs/gallon, so it only factors for about 2% of total mass between a full and empty tank. Seems sa

My SUV is 4500 lbs and has a 17 gallon tank. Gasoline weighs ~6lbs/gallon, so it only factors for about 2% of total mass between a full and empty tank. Seems safe to mostly ignore it.