Moto Guzzi V7 here; 22 litres and 60+ mpg gives close to 300 miles.
You don't need it but it let's you keep going if a petrol station is closed for lunch or the tanker driver decides to go sick or the stuff coming out of the pump looks to be mostly ten year old water. I like a full days range just so I can almost take fuel stops out of my route planning and not ruin the ride doing mental arithmetic and going mental as a result.
Cans are a PITA. They fall off, leak, get stolen, require you to stop in places you may not always choose etc. Now if you can live with the standard tank into the stans, buy one, use it, bin in, that could be a good solution. Only place I've ever really risked running out through a sub-200 mile range has been the very top of Norway and Southern Morocco. Here the small tank boys live to find petrol stations and I have met one or two suffering from enforced pedestrianisation.
Andy
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