Though the Fit was not significantly quieter than the others, its engine emitted a more pleasant, refined sound.

Boeing predicts reduced fuel consumption of up to 20% and significantly quieter engines than current turbofans.

Observations perpendicular to the exhaust would be significantly quieter.

Along with this there are no carbon dioxide emissions and the running of the train is significantly quieter than other trains, trucks or airplanes.

Sometimes the sounds are remarkably subtle - but when a slight overtone is taken away, the car can actually sound better without being significantly quieter.

Medium-sized and large trucks are significantly quieter than they were in the 1970's because of new manufacturing techniques to comply with noise regulations, he said.

New jet airplanes are significantly quieter than older models.

Boeing expects these developments to make the 787 significantly quieter both inside and out.

The high noise levels and vibration in the cabin led to the type's replacement by the significantly quieter turboprop-powered Do 228.

The new ferry is more stable in heavier seas and also significantly quieter than her predecessor.