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Some of the foreigners, with 4x2 units, can carry around 1500 litres of fuel. I'd have to assume that they would have a suitable amount of Ad-blue (if required), too.
I doubt they would do enough miles, to need to refuel, in the UK.
I'll let you do the calculations but, even at 8mpg, 1,500l will take you a long way.
Personally, I tend to fill up, with about 300l each time, 5 times in two working weeks. I average between 1,200 & 1,500 miles per week, I think.
As to where I fill up, my card doesn't allow me any "perks". Except, one place on the A1 gives me a free coffee! So, I choose the place that is most convienient, for me. Other cards do allow vouchers and that might make a small difference, to some drivers, between two places, if one site does and another doesn't issue incentives.
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