[Dr Fly]

its an interesting point, but you are probably not losing 0.3p on every liter, you are losing it on the entire transaction.

Measurement is not an exact science. So every form of measuring anything will have some sort of accuracy tolerance. What it is for petrol pump meters is anybodies guess. but i am guessing they will internally calculate the cost based on their measurement of the fuel served, which could be to a higher precision than what you see on the screen, and then round it to the nearest penny. So you may be getting 1.004 liters, but only see 1.00 on the screen.

Its also worth mentioning, that the measurement of fuel is quite heavily regulated by trading standards, and checked often.

Its also a valid point that most petrol stations have a minimum fuel amount, this could actually be linked to the accuracy standard checked by trading standards, such as under the 2 liter minimum service, the accuracy cannot be guaranteed, so they get round this by making you buy more than two liters.

But honestly, 0.3p. is that the most pressing topic on your mind. you need a hobby or something.