Quote Originally Posted by CaptainGoSlow View Post

On the way there, the dipstick showed 1/2, but by the time I got there (approx 240 miles) it was showing 1/8. I have based the dipstick as being 1L from min to max, so seem to have lost 375ml. Before leaving I put 500ml in, to take me back to 675ml. Since getting back (approx 265 miles) I now have 1/2 dipstick, so only (used loosely ) lost 175ml. This seems like quite a strange result to have received and I was wondering if anyone had any ideas?
At the risk of being a tosser:

500ml - 375ml would be 125ml... Filling another 500ml would leave you with 625ml... Reducing to 500ml would mean you lost 125ml on return journey (Good news!) which is only 1/3 of what you lost on the way there. Strange as the return journey was longer?