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If you shift your Auto manually then sure.
I have an Auto Torque Convertor. I've seen where others have modified the controllers to suite hypermiling by adding a sort of manual override.
However, with VW, they're already pretty good. I'm sure you'll find that yours cuts off fuel to the Injectors when it coasts.
That's not as good as going into N and turning off and automatically turning back on when you want to go back up the other side.
Being a computer-programmer, I was looking into solving this with GPS code. But haven't found enough 'friends' to make it worthwhile.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius 
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