The majority of fares will pay what is on the meter and usually give you a tip. Sometimes big, sometimes small. It works both ways as if its say for example £1.90p on the meter the chances are the customer will give you £2 and say keep the change. If it says £2.10p on the meter then I will often say to the customer just give us £2 but this week I got one customer who I had been told was a bit tight and I didn't know whether to believe it or not so off we set on a short journey that was to be £2.25p on the meter.
The customer paid me using a £2 coin, a 20p coin and 3 2p coins totalling £2.26p. I took the money and out it away expecting him to get out the car but he sat there. I had a feeling he was waiting for his penny change so when I rummaged through my loose change and gave him a penny he then thanked me and got out of the car.
Prior to picking this person up I could see him feeding coins into a slot machine and losing.