Momentum is not good fuel My DC5 needed an emergency top up which had to be Momentum and in literally a few miles it was sounding louder and running rougher.
I always used to think it was placebo until I went from BP ultimate which I ran for over a year (nectar points) to V-power, massive difference. That was however in an import not a UK car.
I dont think it is a fair test to run fuel from one tank straight to another, it will take a while for the ECU to make minor adjustments etc. Try running it for a couple of months then switch, there is a difference.
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