The exact distance you can travel on a single tank of gas with a Harley-Davidson Road Glide Ultra Classic FLHTCU or a similar touring bike will depend on several factors, including the bike's fuel tank capacity, fuel efficiency, riding conditions, and your riding style.
The 2021 Harley-Davidson Road Glide Ultra Classic FLHTCU comes with a fuel tank capacity of 6 gallons (22.7 liters). The fuel efficiency of a motorcycle can vary depending on factors such as engine size, load, terrain, speed, and riding habits. However, as an estimate, many touring bikes, including Harley-Davidson touring models, can achieve an average fuel efficiency of around 40-45 miles per gallon (17-19 kilometers per liter) under normal riding conditions.
Based on these figures, assuming an average fuel efficiency of 42.5 miles per gallon (18 kilometers per liter), you could potentially travel approximately 255 miles (410 kilometers) on a full tank of gas with a 6-gallon (22.7-liter) fuel tank.
It's important to remember that this is a rough estimate, and actual mileage may vary depending on various factors. To get a more accurate idea of the fuel range for a specific model, it's best to consult the motorcycle's specifications or refer to owner's manuals, as manufacturers often provide estimates for fuel consumption and range.