I did tests on premium fuel years ago in Optimax times in Denmark with 1.8 Passat and 2.8 A6 and the end cost worked about the same as regular fuel, I have used Optimax and the V-Power since, have dot done any calculations at todays prices but when I took S8 heads off there was almost no carbon build up in compression chamber, never seen so clean before so yes it seems to keep it cleaner.
Now earlier this year I was visiting friend in near Rugby and almost run out of fuel, range meter showed 0. There was no Shells near so I filled up £40 worth of Tescos Premium 99 octane fuel whatever it is called. On the way home car was a bit more sluggish then normal and did need pressing accelerator more then usual and by the time I got home after 40 mile trip tank was almost empty again, £40 gave me around 60 miles while normally I would expect 120-130. Filled up with V-power and everything back to normal.
I am averaging 17mg in automatic and 18.5mpg in tiptronic in mostly short runs around the town.
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