thats a very preety mini u got there ..
mini cant do 10km/l with ac tell me how u noted or was that a guess .. yar if u bought mini when it costed too much then its not others fault ...
he can check market and about engine i wont be scared .. u can later fit coure's engine or can find the best fit engine for it ...
if your budget is good , then u can get a 99 or 2000 vitz under 5 lacks...