I was stretching the point to make a point, but what i said was correct - putting 50-60kg extra weight in the car just for the privilege of carrying it round for a fortnight when you don't need to is silly.
I find about £30 is ideal for me - that gives me enough for a week's worth of commutes and running around; obviously if i'm going on a trip I'll then put some more in.
My petrol pump vexation is far more serious than finding odd numbers. It's these petrol stations with attached Minimarts. So people pull in, fill up, and then do 15 minutes of browsing for posh ready meals (yes, it's M&S Simply Food I'm looking at). After which when they go to pay, a/ it takes an additional 3 minutes to ring through all their organic hummus and then b/ they ask to do the petrol separately so they can claim that back on expenses.
Petrol stations for petrol and at the most, a Ginsters concession. Supermarkets for shopping. Clear?