I am happy to share my experience after using BHP. I have been using Shell since my first car back in 1996. I did occasionally use Caltex and BP (Back then), but it was just to top up when my car petrol level is low. However, recently about 1 month ago my friend recommend me BHP. I am driving X70 Executive (2021). I can feel the differences after I did the 2nd pump (1st pump still has some balance of Shell petrol in my car).
You can feel the power respond is faster. When you release you pedal midway cruising, you can feel the car continue to cruise for longer distance. Finally, now my meter shows 7.8L/100KM, before that it was 8.3L/100KM.
I highly recommending BHP.