Matt,
1) Costs about £80 to fill on V-Power. Going short journeys around town (c.21mpg) I get about 320 miles/tank.
2) Gentle motorway cruising will get you 30-32 mpg.
3) Service interval is 9,000 miles and the services are: P1 (minor), P2 (intermediate), P1, P3 (major), etcI'm having a P3 service done next week by an indy which will be c.£300. Main dealer quoted me £500.
4) Tax should be £245 p.a.
Have only done about 5,000 miles in mine so far so can't comment on tyres, but there are lots of guys on here who can magic up pretty much anything you need in terms of service items, parts, repair kits (such as for a clicking rear axle) and upgrades!
HTH,
Alex