I've only had my V6 a couple of weeks and have also desperately been trying to find how big the fuel tank is , still not quite sure as needle said 1/4 tank, I then filled up completely with 54 litres. From the last fill up I'd done about 320 miles and hadn't been taking it too easy. I've seen a tech spec saying 63 litres however I'm not sure if this is correct but it may not be far off.
With regard to servicing I'd also be interested in an alternative garage between Ipswich & Cambs as opposed to a main dealer as I've been quoted around £800 for the 72k service, although it is apparently fairly major, seems pretty steep. Good news though apparently is that the 82k service is only £150!! Can't wait!!
However despite this, the car is still the best fun on four wheels I've had, unfortunately it's a little addictive listening to the sound of the V6 when you put the hammer down..............
Best regards
Harv