I'm from Russia Just bought 3 years old RX300 from States. I want to change data of car's computer from American to European - miles to km, F to C. How can I do it ????

you cant realy do this yourself the best advice i can give is to go to a speciailst in import cars :?:

This can be done using a calibrator which is usually used for converting to miles from KPH

However i am sure these are available for MPH to KPH.

You really need to contact import specialists in your country and they will guide you where to have one of these fitted.