fuck i would hate to say it but i filled up on vpower last week for my bmw 3 series and off 15 odd litres so far its already done 200KM where as filling up on BP 95 would get me ~150KM. used to fill 98 from BP and it would do ~150 around the 15 litre mark too
minimal city driving, 50km+ a day travelling on motorways.
will definitely stick with it for a couple more fills to see if it was just a fluke