I have a query about the size of my fuel tank (Volkswagen Touran 1.9TdiS 07). I filled my car up with diesel yesterday, and my tank was already 1/4 full. The Volkswagen owner's manual says it is a 60-litre tank and so I reckon it had approximately 15 litres within. I managed to spend £74.20 on diesel fuel at Tesco at £1.179 per litre. When I got home I did the maths.

I reckon I got 63 litres in, which is more than the tank holds, and if it was already 1/4 full I should have only been able to get about 45 litres in. Am I missing something here? Is the tank capacity really possibly around 17 gallons. Thinking the pumps may be wrong I rang Tesco - they said they would check the pump. I am not sure they checked the right one but they said it was ok and they had 'no other complaints'.

I am left puzzled at how I managed to get 63 litres in a 60-litre tank and how did I get up to 78 litres in the tank. Can you shed any light please at how this might have happened.