Dunno, but checking on petrolprices.com the difference between the cheapest and the most expensive station is 10p a liter. And that for an average filling of 20L motorbike is about £2 difference.
Assuming 4000 miles a year, 50 miles per gallon, the price difference between filling always at the most expensive station rather than always the cheapest station will save you £34 a year… Yeah, £34.
And more realistically if you just go about it randomly compared to always going to the cheapest station it would be half that.
So here goes, you can spend time shopping around, researching the cheapest stations, redirect your routes and save £17 a year. Or, like me, you could just enjoy biking and fill up when and where it’s more convenient.