I use the current millers additive with Shell extra and it's the only combination i have tried that returns high economy and improved throttle response.
That's about the normal dilution ratio - if you want to get through it quicker I'd double it at leastFilled up to the brim with tesco diesel tonight - added 50ml of power plus as I want to get through it quick to get some of this sport stuff.
Has anyone tried this stuff on the PD150 engine, thinking about getting some