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Welcome to the site.
Any of those cars would give you some very decent mileage. It'll probably come down to what is available in your area and how much you want to spend.
As for the mods, I'd forget about the hydrogen. You won't find any gains there.
I'm not certain of this, but I don't think the newer TDIs are happy running SVO.
LRR tires and aero mods are the bread and butter of mods.
Don't forget driving technique! You'll by and far see your largest gains from driving efficiently.
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