sorry bazza but i use my is200 intermittantly, so should i give it a good run on the motorway every now and then ? coz at the mo i do as you say would do harm ?
its not particulary doing it harm, but doesn't do it much good !
a quick blast does it the world of good, try and use the rev range through the gears, try to vary speed and what gears you use, getting it up to temperature will allow any condensation in the engine and exhaust to dispel
the ecu learns how the car is driven, so vary your driving to use all aspects of the ecu settings