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Fourth-generation Yaris ups its scale and sporting quotient, but to what effect?

Toyota’s hybrid powertrains have always delivered fuel economy that's better than the class average, but it has generally come at some cost to drivability. 

This remains the case for the Yaris, even though the 114bhp 1.5-litre parallel hybrid system has been designed to feel more natural under load, with the e-CVT transmission (which isn’t strictly a CVT at all) exhibiting less of the so-called ‘elastic band’ effect than it once did.

Electric propulsion is a real asset in town, enabling the Yaris to be quick off the mark, and the base-spec model’s greater pliancy over its firmer range-mates is welcome.

With revised tuning and more electric power at hand, those yawning stretches of fixed-rpm din are if not banished then at least ameliorated somewhat.

This set-up nevertheless puts its best foot forward on light to middling throttle applications, when only modest force – if any at all – is asked of the naturally aspirated three-cylinder engine. 

The Yaris is therefore especially effective in urban environments because the electric drive motor endows it with the usefully sharp step-off and a healthy measure of the linear initial acceleration for which pure-electric cars are known.

The official claim is that the Yaris can operate on electric power for 80% of the time at low speeds and it seems a plausible statistic if you can learn to use the accelerator pedal deftly enough.

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However, on the open road, the Yaris is still no natural, especially when it comes to anything more lively than merely keeping pace with traffic.

The 114bhp Yaris has enough poke for overtaking – which was a weakness of the previous-generation model often highlighted by owners - but such activites still need to be planned carefully. That's because it can take longer to get from 30mph to 70mph when you put your foot down. 

Indeed, performance is unlikely to be the top priority of any hybrid Yaris owner, although the car does impress from a standstill. The lower-powered Yaris proved quicker to 60mph than the Ford Fiesta equipped with Ford’s excellent 1.0-litre Ecoboost engine.

Admittedly, this small victory can probably be chalked up to the striking effect of the electric motors when pulling off the mark, because how the hybrid system gives up the goods when the engine properly comes ‘on song’ is neither enjoyable nor especially forceful.

The 129bhp engine's characteristics feel broadly similar to those of the less powerful car, but there is a noticeable albeit marginal step up in perfromance. From standstill, the Permiere Edition delivers a decent surge in power, and thanks to the electric motors, there is a pronounced step-off similar to that of an electric car. 

Under load, however, mechanical refinement declines and the e-CVT gearbox produces a lot of noisy revs for only small gains in performance and speed. And at the opposite end below 20mph, there is tendency for the gearbox to whine. 

The GR Sport is also unpleasantly loud because of the way the CVT gearbox operates, with slightly better perfromance compared with ithe 114bhp unit it used prior to this latest update. Throttle response and actual acceleration are better than before, but in general the dynamics still don't quite live up to the GR name.