Mine got 75mi to 10 litres plenty of boosting in August/September 0.8 bar, Kakimoto, gutted cat, filter relocation, fresh service As I've said I think it's the weather, everything else seems spot on!
The only thing I'm pretty sure of is you'll probably need a panhard rod to prevent rear drivers side rubbing! I'd like to know too, wanna get some low offset Rotas eventually!