well i just looked at p&o ferries and its £45 each way, the standard route to the ring in just over 300 miles, but you can modify, or select avoid highways, the earleir in the mornign the ferry is the cheaper it is.would 5 days be long enough would a saturday to a saturday be better because then you get the sunday to rest from the journey, and then also dont have to be to rushed on getting there, and getting back lol.fuel out there is so much cheaper then here, just have to pay before you fill, if you say 200 miles to a tank,inbetween 50-80mph most of the way, with a few put your foot down moments, and our tanks dont hold no more then £45 quid so i reckon around £400-£500 like you said, what you think?