[Engine] Fuel Consumption

[Oldskool]

Over the last month or so the mpg seems to have dropped off, normally  get around 600 miles to a tank however i drive it i'm now getting less than 500 

Done the obvious forced regen but its made no difference , could it be something else ?

[Peter Palmer]

Maybe its just the winter diesel they use this time of year, I get about 4mpg less as soon as it starts getting colder. Dark and rainy nights = headlights and wipers on more, longer to warm up so less efficient. It all adds up.

[Oldskool]

Maybe its just the winter diesel they use this time of year, I get about 4mpg less as soon as it starts getting colder. Dark and rainy nights = headlights and wipers on more, longer to warm up so less efficient. It all adds up.

It didn't do it last year ?

[Lighty]

When you say you did a forced regen, what do you mean, do you have diagbox ?

[Oldskool]

When you say you did a forced regen, what do you mean, do you have diagbox ?

What i really meant was i did 30 miles in 4th gear doing 70mph 

[ron]

I thought it would regen on a decent run irrespective of gear selection?I would love comments on this.

[Oldskool]

I thought it would regen on a decent run irrespective of gear selection?I would love comments on this.

I was recommended to do this ?
 Besides fuel usage is less than 500 has been 600+ for the last 2 years.
Have had no warning lights or anything abnormal happening  ?

[cancunia]

I thought it would regen on a decent run irrespective of gear selection?I would love comments on this.

Besides the link below, I've read elsewhere that a constant 40+ will initiate a regen. The Italian Tuneup 70 MPH in 4th will also raise the exhaust temperature so may do the job without the need for a regen.

https://www.theaa.com/driving-advice/fue...te-filters

I have no ideas about the OP's fuel consumption tho.

[Lighty]

Ok, so driving in 4th at 75 does not = A forced regen.
I have to be honest and admit I do not know the exact criteria, but it is way more likely to be driving in 4th or 5th gear at 40 or 50 mph, at least 1/4 rank of fuel & engine temp at normal, all windows shut.
Once the car detects these criteria , it will alter the fuelling & ignition timing, which will increase the dpf temp high enough for a regen.
Driving it like you have done, will not work Iam afraid , dpf temp nay get to 150/180 degrees, where as on a regen it will exceed 350 degrees.
A workshop can initiate a “forced regen “ on a laptop, by strictly following very specific instructions, if all criteria is met , then a regen will occur.

[jj9]

You can put your hat on upside down and drive it anyway you want, but it won't do a regen unless the soot content is over a set level.


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