Here in the US, it has been my experience that I need a range of at least 150 miles when touring. I routinely travel over 200 miles per tank with my RS. The mileage countdown feature has proven remarkably accurate. I have taken it down to as low as 4 miles and filled with just short of maximum fuel capacity on my ‘16.
That said, I do plan ahead and try to anticipate availability of fuel and arrange my stops to suit.
“I would rather be ashes than dust!" ~ Jack London