Last Update............
...... I have now run a tank of std shell diesel through and two tanks of std diesel with Millers (1 x single dose, 1 x double dose).
I'm really chuffed to be finally feeling the benefit of the Millers. It feels pretty much the same as the Shell V-Power. I'd say the V-Power is smoother but for power the Millers is its equal in a single dose and better in a double dose.
My final conclusions now are that I will probably run Millers on Std diesel but only with a single dose. It gives me what I want from that, although its a shame that it doesn't feel as smooth. It works out a couple of quid a tank cheaper to use the Millers than V-Power.
MPG in my view is not really altered by more than maybe 1 or 2 MPG if you're lucky. I wouldn't bank on getting any MPG result but for the power alone its worth using.
Lastly - my testing is really for myself more than anything and is only judged against my commute in my car under my driving style and preferences. It might be that you have a totally different experience but for me, over the last 3600 miles of this test sequence I have my answers and shared it with you so that you can make your own conclusions over what you've read. Hopefully it'll be of some
help to you to see my real world experience.
Just one more thing..... has anyone noticed that the Shell pumps dispense faster on V-Power pumps than the std Diesel pumps. (I'm on a major role of sad b'stard observations at the mo'. I'll put it down to approaching mid-life crisis!)