Unless I've missed something here - how will you get the loyalty bonus if you have a BMW?
With the loyalty bonus it would be a great time to buy a GTI though, I'd be tempted myself...
... oh, hang on a minute...
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It also applies if family members at the same address or with the same family name have a VW, doesn't have to be yourself. If that makes sense.
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Ahh, you have a VW in the household already. I see.
Personally speaking, in 20 months of ownership my GTI (manual) got low thirties to the gallon, for arguments sake 33mpg.
My R is struggling to get 29mpg average so when you consider a GTI is just as quick to 4000rpm which is where I spend 99.9% of my driving then the R has the fuel penalty 100% of the time for a sub 1% of the time performance advantage.
I drive defensively rather than aggressively so tend to anticipate rather then react which in theory should be better for fuel consumption but I don't seem to get better figures than anyone else on here!

If I were in your shoes I'd get a GTD DSG and add a tuning box.