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I've put 60K miles on mine and still fine the engine to be very quiet compared to most other vehicles in it's class. I did find early on trying different motor oils seemed to increase engine noise-don't know why, it was just an experiment and that's what stuck out the most. The thing that still impresses me the most is how quiet the a/c compressor is-no loud click or hissing sounds under the dash as in some vehicles.
I did find the new chevy sonic and ford fiesta to be very quiet, but I believe it was mostly due to sound deadening in the firewall and not the engine being any better design. Neither the Yaris nor Honda Fit use a lot of sound deadening which saves on weight and cost, but adds noise when accelerating. Now that I think about it both the sonic non-turbo and fiesta use costly, pain in the butt timing belts and it's always been said they are quieter in operating than a timing chain as the Yaris has.
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