Drove over 100 miles on the motorway today and noticed a drop in mpg, compared to what I am used to. I also noticed foggy windscreen and windows, as if air con was not on.
Observations:
First few days of 0C - -2C temperatures.
On motorway MPG was sometimes sub 40mpg and even sitting in the 30s, while under light acceleration or even just feathering the gas to maintain speed.
Usually I would be expecting at least 60mpg. I even get this on my 20 mile motorway commute most days. Possible DPF regen which seemed to last for ages?? Could it be the low winter temperatures reduce MPG this significantly?
The air con did not seem to blow colder than the air coming into the car when turned on and off.
The MPGs did go up, but then fell again. Seemed somewhat sporadic as I watched the live MPG reading on the dash. Cannot believe I should expect to see around 34 mpg while on a motorway and driving alone quite normally.
I have attached a photo of something that may be relevant. The photo is the metal pipe running down from the air con gas valve. Greenish black residue.
Any thoughts welcome.
Thanks,
Stu
p.s. another observation not seen before (which may be as a result of freezing temps lately)... on the motorway the day before, I noticed under acceleration, with a possible drop in mpgs, a lot of light steam like exhaust covering the rear window. Only under acceleration, and it evaporated albeit I couldn't see out of my rear window! I am hoping this was just a DPF regen as it stopped after 5 minutes or so and has not happened since. Is this normal in cold temperatures?
Mazda CX-3 1.5 diesel
2017
