I don't know about HK or South Africa, but there is no such rule in Singapore. However, diesel passenger cars are taxed differently (significantly higher road tax), which makes diesel cars uncommon. However, almost all (probably all but I can't be sure) of the taxis run on diesel (different taxes again). In fact, I've had a ride in one of Comfort's newfangled Sonata taxis, and that thing is so damn quiet I can hear my tinnitus. The old Toyota Crown taxis sounded like trucks it's like night and day. Diesel has long outgrown its smelly, noisy image.





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