Sudden MPG drop

[Deleted member 23024]

I have learned to live with my average 41-42MPG from my FR TDI doing mostly motorway driving, but this last week its dropped to around 30-32 now that seems more than seasonal variation. I have checked the tires and always use millers and have no idea why it suddenly drop so low?

 

[ares]

Have you been using air conditioning or clima?

 

[Deleted member 23024]

Have you been using air conditioning or clima?

Nope not at all think i have basically struck most of what is user error and in feed up of francis seat telling my anything about 30MPG is good for a diesal

 

[/dev/null]

Could be DPF is getting full or a faulty sensor.

 

[Deleted member 23024]

Could be DPF is getting full or a faulty sensor.

Had a sensor replace beginning part of the year on the DPF though have had the fault codes read recently and nothing has come up other than my faulty bluetooth module

 

[mrsixstring]

Is this a manual calculation or from the computer? If from the computer try calculating it manually and see if it's the same.

 

[Deleted member 23024]

Its both though the computer is saying worse than i am its still alot

 

[robdf2]

is your zorst more sooty than normal?
could point to it running rich? hows cars performance?

 

[Tam]

is your zorst more sooty than normal?
could point to it running rich? hows cars performance?

DPF will stop the soot getting to the end of the exhaust, so wont be able to tell either way on that.

 

[Deleted member 23024]

The car does feel a little underpower

 

[/dev/null]

Bear in mind that weather also has an impact - if it's raining then I get between 5 and 8 MPG less than normal on my work run!