1) This is a more powerful engine, and a brand-new one, in a heavier car. Yes, economy should improve as the engine wears in (expect it to get better right up to 10,000km or so), but no guarantees it'll beat the 103TDI on economy overall.
2) Yes, the RNS-510 has one DVD slot only. The Sat Nav DVD does not need to be in the drive; the maps should be installed on the hard drive. If not, follow the instructions on the map disc case to install them, or speak to your local service department.
3) No. DVD videos must be in the drive to be played back.
All your questions about the RNS-510 are answered in the VW Car Audio and Electronics forum.
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