On the old scheme 150 litres would get you 75p. But if it’s now 25p for 100 litres, then would 150 litres give you 32.5p? I doubt it. You probably need to put in denominations of 100 litres, earning 25p for each 100.
Realistically then, how much would an average driver collect in a month? £2, £3, £5? That’s a Greggs steak slice or two… for bringing thousands of pounds of revenue each month. No thanks.
I remember not so long ago collecting a couple hundred quid of Nectar points each year, until they stopped giving them with bunker fuel. Those Nectar cards were quite a good perk. I’d get a few weeks shopping in Sainsburys each year which didn’t feel insignificant to me.