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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKVII-Mk7 Golf family including Golf Wagon (~ 2015 +)

VW MKVII-Mk7 Golf family including Golf Wagon (~ 2015 +) Discussions area for the Mk7 (2015+) Golf and Golf Wagon TDIs based on the MQB (Modularer Querbaukasten) platform.

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Old November 10th, 2019, 16:16   #1
aditud
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Default Increased fuel and AdBlue consumption

I picked up a "new" GSW SE 6MT right after the stop sale ban was lifted in the Spring of 2017. Naturally, it had the Phase 1 completed. I sensed no real change in terms of fuel economy from the GSW SE DSG I sold back to VW that same Spring.

Now, fast forward to December 2018 when I had Phase 2 done. Once again, I didn't really notice anything changed. It appears they didn't fill the AdBlue tank while doing Phase 2, nor did they do it when I had the car in for the 30K maintenance service. I had filled it when the car had about 28k miles on it (between Phase 2 and the 30K service), or something like that.

The AdBlue light came on at about 35k, definitely at less than 7k after I had filled it all to the brim myself. Also, starting sometime in August I began noticing increased fuel consumption, achieving around 3mpg less than I used to (I had the car sit for about a month in July while I was on a trip to Europe). On my commute I would routinely achieve 50mpg on my way back driving around 73mph on mostly highway. After August, 48mpg was a rather rare achievement. During October it got worse, maybe 45-46mpg, even though the weather was still fair and warm. This past week we had a couple of mornings slightly below freezing and was barely able to get 44mpg, and this past Friday (when it stayed at around 32-34F throughout the day) I didn't even get the advertised 43mpg.

Anyway, I can't help but wonder whether there's something going on. I certainly didn't expect to have to refill the AdBlue tank after 7k, and I can't really explain this dip in fuel economy, as my driving habits haven't changed.
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Old November 10th, 2019, 16:18   #2
ProfBrown
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I have a buddy who quite literally over a camp fire was talking to me about the same issue on his 15 Jetta TDI 6mt. Subbed to see what people say.


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Old November 10th, 2019, 19:43   #3
Lightflyer1
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More than likely winter treated fuel. See if it goes back up in the spring. Even though the temps may be warm they are still treating the fuel getting ready for the cold.
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Old November 11th, 2019, 10:11   #4
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I'll chime in for the fuel usage and agree it is likely the winter blends. Mine dropped off in the past few weeks. I'm on the other side of Pa.
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Old November 11th, 2019, 11:21   #5
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Quote:
Originally Posted by Nutty 5.0 View Post
I'll chime in for the fuel usage and agree it is likely the winter blends. Mine dropped off in the past few weeks. I'm on the other side of Pa.


For reference the buddy of mine was having his drop drastically in Ventura, California. So yes we get a winter blend but I am also on So Cal, and I have not noticed this mileage drop or increased def usage.


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Old November 11th, 2019, 11:38   #6
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I have read here that a full dpf can also cause this to happen. A monitoring app like VagDPF would show the soot and ash load.
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Old November 13th, 2019, 10:02   #7
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Winter fuel and cold temperatures kill fuel mileage in these TDI's. I easily get above 45 MPG in the summer commute. That MPG struggles to get to 40 in the winter.
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Old November 13th, 2019, 15:55   #8
JM Popaleetus
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Increased AdBlue usage is to be expected with the emissions fix. I too just went through 2.5gal in ~6000 miles.
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Old November 13th, 2019, 16:01   #9
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Increased AdBlue usage is to be expected with the emissions fix. I too just went through 2.5gal in ~6000 miles.


I have only ever owned my car with phase 2 done and I do about 7500-10k on 2.5 gallons of def. US gallons that is.


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Old November 14th, 2019, 09:22   #10
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the tank is bigger than 2.5 gallons thou?

My question is is the commute the same? are you driving 20 miles plus per drive?
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Old November 14th, 2019, 09:33   #11
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the tank is bigger than 2.5 gallons thou?

My question is is the commute the same? are you driving 20 miles plus per drive?


Yes I do commute more than 20 mile drives. Minimum drive from my house to town is 25 miles. To school itís 60. Shy of in town driving to get lunch from work or gym of course. Both those numbers are 1 way off course. And yes the tank is larger than 2.5 gallons, about 5 gallons I hear, but the cans I buy at Walmart are 2.5 gallons and those seem to get me almost get me through if not a tad over the 10k oil change interval.


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Old November 15th, 2019, 07:00   #12
740GLE
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7-10K on 2.5gal of def is in line with what you should expect. if you were draining 5 gal or a tank in the same distance i'd be worried.
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