I was running 98RON which averaged 1.55 Euro per litre at Motorway Service stations. So fuel costs were 490 litres - 759 Euro - £640. Coming off the Motorway where I could, the average price per litre of Super Unleaded dropped to 1.38/l - which would have saved 85 Euro on the whole trip!
For our US friends, that's just over $7.60 a Gallon