i would say the condition is good considering the bike is over 25 years old.
RWP registered, have all legal docs.
parts, well if u got the cash u can get parts, i got my parts from the UK, from a import bike specialist called BAT motorcycles in London.That was about 5 yrs ago.Tyres side panels,brake kit,clutch,carb kit,rear light etc.
Performance, again considering age, obviously nowhere as fast as CBR, but alot better than a new 125.
average on petrol? no idea !
i Hope that helps?