I normally buy my booster from Halfords, they do two grades, one at £9.99, the other costs £19.99 which is marked Racing. I buy the second one in the hope it will make a difference,I add it when I fill up, £40 petrol, £20 booster.Is there a cheaper way to buy booster? This one treats 60 ltres or a full tank in my case.I use sul no V power in my part of Somerset. Cheers Mick.

 

Millers OB normally 1 bottle to a FULL tank costs about £3 but you can buy bulk from j-w racing or camskill.

 

another vote for millers as it's simple to use without any measuring at the PFS..