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Why do automatics use more fuel?

Why do all the new Korean cars (Kia, Hyundai) have such appalling CO2 and fuel consumption figures when an automatic 'box is fitted?

I wrongly thought that when they progressed to dual-clutch boxes CO2 and fuel consumption would be like a VAG car and as good or even better than manual gearboxes, what's wrong?

Asked on 26 November 2014 by sg&p

Answered by Honest John
Very few of them have dual clutch boxes, mainly because these boxes are unreliable compared to the trusty old four-speed and six-speed torque converter autos.
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