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Assuming you can have absolute control over the shifting in the semi-auto box, the FE should be just about identical to a manual transmission with some extra weight. The DSG-type boxes do not have torque converters, just regular clutches that are automatically controlled for you. So no loss through the converter. The DSG boxes are generally heavier than the regular manual ones, so you do take a small hit from the extra weight.
It may not be possible to bump-start a DSG. In that case, you either do without engine-off coasting, or you resign yourself to always using the key to re-start. That could hurt your economy figures versus lots of EOC.
-soD
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