Many factors could be in play, however.. I found the simply cleaning the O2 Sensor made a dramatic difference in MPG. It can get clogged with soot, and then it's less able to give proper readings for O2, which seems to make for too rich, and more regens.... and ironically more soot. The sensor is easy to remove with the right tool, and it can be done in less than 20 minutes. Compressed air is the best way to clean it. Chemicals could damage it, but I used brake parts cleaner and had no apparent damage when I did it.Hey there. So I filled up diesel at Husky today for $64 and then I go to check my estimated range and it says 502km only. Usually it’s around 750 to 800. I feel like my CTD is not nearly as efficient as it should be. Any ideas why it could be doing this.
The other sensor that gets sooted up is the MAP pressure/Temperature sensor.. there is a write up in the DIY section on this, this sensor is on top of the engine, in the induction. Many have reported MPG loss when this sensor gets sooted up.. so try cleaning both and see what you get..