engine revs when clutch depressed

[djct_watt]

I think it has more to do with engine management and a heavy flywheel than the drive by wire. I notice the same thing on both my tC in the USA and the yaris here in Thailand. Here is a simple test:

turn the key to on, but do not start the engine. Do this in a quiet place. Now press the accelerator and release, and you can hear the throttle plate responding... It's near instantaneous with no lag.