Yes of course.
Yes, have done a few times, usually once every 30-40k km.
Depends on driving style also. Many just cannot drive smoothly enough to get better FC.

Once tried the chemical spray, doesn't seem to do much. Twice did the traditional method where the shop opened the intake then manually scrape out the carbon with help of cleaners. Haven't tried walnut, maybe next time.

Parts are still easy to get for both new and half cut. Can join the IS250 and Mark X FB Clubs for lots of info.

I did at Multiplex Auto, forgot how much but not cheap, maybe around rm300 now.

Ok laa.. If want to talk about best handling in class is still behind the German ultimate driving machine..
But still consider one of the best around due to sportier set up and large sport rim..

If got chance try to test drive the older Toyota/Lexus Altezza/RS200 (BEAMS + 6-speed manual) is even more better in term of agility & fun to drive factor compare to XE20/30 later IS250 & above.. 

If you buy this car,

1. Go to workshop ask them to clean your intake valves.
They will remove intake manifold, depending if they not using walnut then use chemicals to soak the valves, slowly dilute the carbon build up, then scrape away.

2. Replace fuel filter (will get clogged if never change before)
3. Do engine flush
4. Pour in Gumout so that it can clean the injectors.

Xe30 better handling than F30?? Which F30 was that?

Thanks...
What FC are you getting so far?
Just want to know how many liters of engine oil for the V6?

Thanks mate..

I assume it's the normal version, not the MSport?
Should be able to get a bit better FC than that. What's your best full tank distance when the fuel warning light comes on?

6.5l is a bit over,  ideally only about 6.2-6.3l but for me I just put 6l enough and easy so no need to have spare 0.5l lying around.