Ran the triple dose through on a week away in the Lakes. Mostly steady driving, not much hooning about (partner and her grand-bairn in the car). No real power increase felt, but it did feel smoother and quieter. Definitely less startup smoke and less of the Massey-Ferguson soundtrack.
MPG on the tankful for 533 miles was an indicated 45 according to the trip computer but worked out at an actual 38.... is this what others have seen? I normally get about 40 indicated with 37ish calculated.
On the double dose now. I can't really tell any difference between double and triple doses. It has had an intake manifold cleanout and several treatments such as BG44, Diesel Magic and Millers in the past 12 months though.
I can't rule out something else on the car being nackered and to be honest it wouldn't surprise me if something was.
Make something idiot proof and someone will only go and build a better idiot...