This may be a clever money making scam by Europcar:
As is completely standard with all car hire, Europcar at Kerry airport took a swipe of my credit card prior to the hire for deposit purposes. I returned the car incident free at the end of the hire and went on my way.
Upon checking my credit card statement on-line after arriving home I discovered that there was an £8 shortfall in the refund. Further investigation revealed that this was because Europcar took payment in Stirling and refunded in Euro, using their own interpretation of the exchange rate.
Normally, car hire deposit never shows on my statements as they are simply 'holding deposits' so I can only conclude that this was a deliberately sharp practise to increase revenue.
I contacted my credit card provider who immediately refunded the difference.