Yeah I am trying different fuel brands as well as different conditioners. I had a new product from Kleen Flo recommended to me called a "one shot". Its a tiny little bottle that is supposed to be the big thing right now. Not really sure if it will do much but we will see. I have seen a marked improvement by using howes Mean Clean..Now that the bottle is done, I'll try these little one shots. It seems to me that the Esso station here is selling the crapiest of crap diesel too. I try to avoid it but my options are esso, esso and fas Gas which my inderstanding is just esso. I have now been getting about 620km on about 75-80 liters which is much better but would still like that to go up over the 700 mark, not factoring in the ratio difference. I may be dreaming though lol. Time will tell I guess. Anyone have any suggestions as to where to get diesel from. In Calgary my options are limitless but in the small town where I live not so much. Where do you get Redline or standynes? (I think thats what it was called). The one bottle of this Kleen Flo I put in stopped any black smoke but the tank wasnt done and I added the howes so not sure if that helped or if thats even safe. And yes I added diesel to the tank to fill it up.