The U340E Transmission in your Yaris

[jack black]

Corollas AT had smooth shifts but it shifted gears all the time in city based on gas pedal input. When I serviced corolla's AT filter at 60,000 miles it was full of debris. Yaris AT has very conservative shifting and only does it when needed (ie mainly on speed input, like old fashioned AT). I serviced it also at 60,000 miles and the fluid and filter were almost spotless. Looks like Yaris is optimized for longevity, but not for the NVH touchy feely stuff.