Belgium, Germany, Switzerland, France Route Advice Please!

[M3S]

Hello all. Long time lurker and lowly CS owner here. Over the years I've read a lot of excellent route advice on here and was hoping I could ask for some more.

In the summer myself and a few others are doing a bit of a road trip. The route is so far something like this…

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Start in London

Through Belgium via my friends brewery in Vleteren, plus maybe via Spa depending what is on.

Black Forest

Nurburgring

Through Germany to the BMW Museum in Munich

Then over to Switzerland to do Gotthard / Furka / Grimsel / Susten

Back home via France.

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Questions…

1. Black Forest isn't finalised yet but it should be pretty straight forward hopefully, however if anyone has a good route or some must do's that would be great.

2. Nurburg to Munich. This is looking like a long drive with not much action. Are we just going to have to suck it up or is there anything worth doing?

3. Munich to the Swiss passes. Is it worth a detour to Glossglockner? Anything else?

4. Thinking of doing Reims on the way back as I love a bit of history. I know there is some good roads to be had in eastern France but I'm not really finding anything easily. Advice would be great.

5. Finally, any petrol advice? One of us is taking an E60 M5 so I know he's going to have a fairly whopping fuel bill…

That's all. Sorry for the fairly epic post, I just want this to be as good as possible so any advice / pointers would be greatly appreciated.

Cheers guys.

Mes