Regarding fuel, when I had my Mk4 Golf (a few years ago now) I found I got better mileage and power from the higher octane fuel. I used to put Utimate in it. I wouldn't worry about the price of the fuel - it will be returned to you in mileage.
If it really concerns you, check out the diesel version.
We diesel drivers are most smug when the diesel's cheaper than petrol. Happens a lot these days.
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