Why is fuel economy so awful for autos?

Why is fuel consumptions so bad in automatics, compared to the manual versions? It appears to be worse with Kia/Hyundai/Ford, most with dual clutch boxes. VAG group cars and BMWs seem to roughly match the manual and auto models consumption.

Asked on 5 December 2014 by sg&p

Answered by Honest John
Because torque converter automatics absorb power. The upside is that they are much longer lasting, much more reliable and much cheaper to maintain than dual clutch 'automatics' all of which require a change of fluid every 3 years at a cost of £300, increasing the annual fuel ill by £100.
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