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Drop in mpg on gtd

Graham001

New member
Location
Notts
Hello, I’ve recently noticed a large drop in mpg on my 16 plate gtd. normally on my way to work I’ll get between 43 to 46 through town on a quite morning. This never differs and it’s been like that since I purchased the car . I now get low 30s trying my hardest to cost up to traffic lights and keep rolling. Same on steady motorway trips as well, where before I’d get low to mid 50s I’m now in low 40s. I’ve noticed no difference in power , car feels the same, tyre pressures good .
Has any body experienced this or any ideas, thanks
 

Jayzeable

Passed Driver's Ed
Maybe regens..??

...tbh mine has dropped but I think that's due to the colder weather we are having. Waiting for the car to defrost + heated mirrors + heated seats (on full).
 
Last edited:

Graham001

New member
Location
Notts
Thanks for quick reply, I’ve had no warning signs on dash , is this normal ?.
I’ve just googled the regen you mentioned and I’ve got to admit I’ve been doing a lot of short journeys lately, I’ll give it a good run on motorway in a lower gear and report back.
Is this the normal thing to do , I’ve had no experience with diesels before, thanks
 

Graham001

New member
Location
Notts
Hi I’ve given car a good run on motorway a couple of times over weekend then I’ve just been on another round trip on motorway of 40 miles where I stayed between 50 and 70 and tried my best to get highest mpg I could. I averaged 49 mpg which suppose is ok but still think it’s slightly down on what I use to get. I would of expected more 53/54 Ish. How would this compare to any body else’s , thanks .
 

Carlosfandang0

Go Kart Champion
Location
UK
Ride
2016 Mk7 GTi
Hi I’ve given car a good run on motorway a couple of times over weekend then I’ve just been on another round trip on motorway of 40 miles where I stayed between 50 and 70 and tried my best to get highest mpg I could. I averaged 49 mpg which suppose is ok but still think it’s slightly down on what I use to get. I would of expected more 53/54 Ish. How would this compare to any body else’s , thanks .


Might be something to do with diesel now having winter additives in it! It’s known to cause a reduction in MPG.
 

jimlloyd40

Drag Race Newbie
Location
Phoenix
Ride
2018 SE DSG
Hi I’ve given car a good run on motorway a couple of times over weekend then I’ve just been on another round trip on motorway of 40 miles where I stayed between 50 and 70 and tried my best to get highest mpg I could. I averaged 49 mpg which suppose is ok but still think it’s slightly down on what I use to get. I would of expected more 53/54 Ish. How would this compare to any body else’s , thanks .
We're you using the heater? What was the temperature?
 

Jayzeable

Passed Driver's Ed
Hi I’ve given car a good run on motorway a couple of times over weekend then I’ve just been on another round trip on motorway of 40 miles where I stayed between 50 and 70 and tried my best to get highest mpg I could. I averaged 49 mpg which suppose is ok but still think it’s slightly down on what I use to get. I would of expected more 53/54 Ish. How would this compare to any body else’s , thanks .

I left work this afternoon, and drove through terrible traffic on the M62 motorway. I managed this:

52.6mpg Avg Consumption (Since Start)
17m Distance
0.26h Traveling Time
8Deg C

Just note, the drivers heated seat was on full, the heated mirrors where also on.

This morning going to work I only managed very low 40's mpg on the motorway, and Friday I had high 30's but this was on the A roads.
The cold weather will lower your mpg.

One thing I do find, if you just relax, enjoy the drive, stop watching the mpg ...I get better mpg! :)
 

Graham001

New member
Location
Notts
I did have the heater on , heated seats were off , mirrors were on as usual I never turn them off , not sure if this will do any harm or not . Outside temp was quite cold probably around 6/7 degree .. I suppose around 50 is ok on motorway but I’ve mid 50 s before without trying,, Thanks
 

jimlloyd40

Drag Race Newbie
Location
Phoenix
Ride
2018 SE DSG
I did have the heater on , heated seats were off , mirrors were on as usual I never turn them off , not sure if this will do any harm or not . Outside temp was quite cold probably around 6/7 degree .. I suppose around 50 is ok on motorway but I’ve mid 50 s before without trying,, Thanks
Usually people think that only the AC affects fuel mileage but the heater does also. So if you are comparing your mileage with the heat on to when you didn't need heat the mileage will drop.
 

sprinks

Go Kart Champion
Location
United States
Also: how are you measuring MPG? The computer calculator is pretty rotten at getting accurate measurements as i recall, and anyone wanting real MPG was using an app, like above, and tracking mileage between tank fills.
 

jimlloyd40

Drag Race Newbie
Location
Phoenix
Ride
2018 SE DSG
Also: how are you measuring MPG? The computer calculator is pretty rotten at getting accurate measurements as i recall, and anyone wanting real MPG was using an app, like above, and tracking mileage between tank fills.
Most accurate way is to write down your odometer mileage with a full tank and then when you refill divide the miles driven by the number of gallons to the tenth to calculate your mileage.
 

Graham001

New member
Location
Notts
Thanks everybody for your reply’s , I’m noticing a difference with the colder weather. Probably everything switched on and engine oil thicker.? Thanks again
 

Geoffers

New member
Location
Maidstone
I’ve also noticed a drop in MPG lately. Thought it maybe related to my DSG issues so got a new OBDeleven, plugged it in and it read 3 faults in relation to the Nox sensors in Bank 1 and a Nox catalyst efficiency reduction in bank1?! Have been told this will effect fuel consumption....which it has, as well as power!!
 

Graham001

New member
Location
Notts
I’ve also noticed a drop in MPG lately. Thought it maybe related to my DSG issues so got a new OBDeleven, plugged it in and it read 3 faults in relation to the Nox sensors in Bank 1 and a Nox catalyst efficiency reduction in bank1?! Have been told this will effect fuel consumption....which it has, as well as power!!
Hi, have you had this fixed . ? And is the OBDeleven something any body can by and use. Just wandering if I've hot the same problem ,thanks
 

Carlosfandang0

Go Kart Champion
Location
UK
Ride
2016 Mk7 GTi
Hi, have you had this fixed . ? And is the OBDeleven something any body can by and use. Just wandering if I've hot the same problem ,thanks
OBDeleven is an OBD dongle and APP, it’s android only and commercially available to anyone,

Alternatively there is VCDS (which i use) it is a far more powerful tool but does cost more, with that cost though you get first class product support from the guys at RossTec

This is where I purchased mine,
 

Geoffers

New member
Location
Maidstone
Hi, have you had this fixed . ? And is the OBDeleven something any body can by and use. Just wandering if I've hot the same problem ,thanks
Got my OBDELEVEN from Amazon. It’s the new version and works with IOS as well now.
The issue is still ongoing. Went into dealer Monday who did a DSG reset. Not really improve things and mpg is still poor. I asked them to look at the fault codes but conveniently they erased them when they did the DSG reset!!! Now booked into another dealer to look at week Tuesday. We’ll see!
 
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