I have one and they are hideously reliable, mine had 27,000km on when i got it and now has nearly 104,000 combined miles and Ks. It doesnt go wrong and the single biggest expense is spark plugs (other than the odd go faster bit). The service interval is whenever i get the impression it feels like it needs doing. I change the oil before every track event
Get your name down on the group buy list for the Denso plugs they will get rid of any misfire at around 5000 revs if you have that (quite common) and if you dont then you wont get it when you tweak the boost up a bit
Petrol wise is entirely geared to your driving style, i can get near 30mpg if driving like a a little old lady however prodigious use of the right foot will bugger that completely
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