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Alessio
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From first hand experience, the first generation of hybrid buses in use in London (single deck) were a bit noisy. The engine was small and running continuously at high revs. It sounded like a portable generator at a concert. The second generation (still single deck) was already better in confort level. I hope they improved even more with these double deckers. Real word usage shouldn't be that different from tests, since driving conditions are really optimal for series hybrids, with lot's of start&stop (bus stops but also traffic jams and crossings). I think they claimed around 40% fuel reduction but I can't find the link to the source.