The average range you can expect from a tank of gas on touring bikes like the Honda Gold Wing or the Harley-Davidson Road King can vary depending on several factors, including the bike's fuel efficiency, fuel tank capacity, riding conditions, and riding style.
The Honda Gold Wing, known for its comfort and long-distance touring capabilities, typically has a larger fuel tank capacity. The latest models of the Gold Wing have a fuel tank capacity of around 20.8 gallons (79 liters). Considering its fuel efficiency, which can vary depending on the specific model and riding conditions, you can expect a range of approximately 250-350 miles (400-560 kilometers) per tank of gas.
As for the Harley-Davidson Road King, it typically has a fuel tank capacity ranging from around 5 to 6 gallons (19-23 liters) depending on the specific model and year. The fuel efficiency can vary based on factors such as the engine size, riding conditions, and individual riding style. Generally, you can expect a range of approximately 150-250 miles (240-400 kilometers) per tank of gas on a Road King.
It's important to note that these ranges are rough estimates and can vary based on numerous factors, including riding conditions, terrain, speed, and load. Additionally, aftermarket modifications or changes in riding style can affect fuel efficiency. To get a more accurate idea of the range for a specific motorcycle, it's best to refer to the manufacturer's specifications or consult with owners who have firsthand experience with the particular model.