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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 April 11th, 2019, 18:20   #16
1854sailor
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This means absolutely nothing unless you have calibrated the MFD reading using VCDS to correct it with hand calculated values.

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Old April 11th, 2019, 18:21   #17
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You never had a jump in mileage. All you had was a short trip that was an anomaly to full tank averages as shown by your fuelly numbers vs your short trip. It has been pointed out to you by others as well that your short trip really has no meaning. I only average about 38mpg currently over two years worth of fuelly recording. But I could go out and drive my car for a short distance and show pretty much what you did in your short trip. It would also be meaningless.
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Old April 11th, 2019, 18:42   #18
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You never had a jump in mileage. All you had was a short trip that was an anomaly to full tank averages as shown by your fuelly numbers vs your short trip. It has been pointed out to you by others as well that your short trip really has no meaning. I only average about 38mpg currently over two years worth of fuelly recording. But I could go out and drive my car for a short distance and show pretty much what you did in your short trip. It would also be meaningless.
I understand your point and acknowledge it. My gripe with your theory is if I take the same exact route every single day and know what my normal number and I as the driver haven't done anything out of the normal routine and then see a difference in what the car has calculated (whether is wrong right or worthless) something has triggered the change. That same change over time if it truly is a higher FE reading will alter what you get in fuelly.

Had I got 40.9mpg from the car, I would've posted asking why I see a difference with no reasonable explanation. I

At what point does the jump in readings lead to answers in my last comment/post?
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Old April 11th, 2019, 18:48   #19
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This means absolutely nothing unless you have calibrated the MFD reading using VCDS to correct it with hand calculated values.

Yes, thank you. The point of posting it was to ensure my "claims" were supported. I have acknowledged that the number is inflated and I've also linked my fuelly. My question remains; how can I drive the same route 5 days a week, do nothing different and have consistent weather but see the car getting higher and higher "worthless" numbers.

I get time will tell with fuelly, I'm looking for insight from other '15 TDI owners but majority of the response is that I can't look at my info center at all or post about a new thing I've noticed with the car.
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Old April 11th, 2019, 19:08   #20
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All the back and forth about accuracy of the car's reading aside, you make a good point. This reminds me of dyno numbers: It's not the number that matters so much as whether or not it's different from the last one. Same here.

I'd suggest you watch and see if this was some one-off anomaly, or a if a trend develops. Tail wind, favorable temperature and humidity, cooperative traffic...those and other factors can combine to provide a high number. If it repeats a few times, or, as you mention, it shows in improved full tank FE, then you've got something to talk about. And I'd say the same thing if you'd gotten 40 MPG instead of 60.
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Old April 11th, 2019, 19:34   #21
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All the back and forth about accuracy of the car's reading aside, you make a good point. This reminds me of dyno numbers: It's not the number that matters so much as whether or not it's different from the last one. Same here.

I'd suggest you watch and see if this was some one-off anomaly, or a if a trend develops. Tail wind, favorable temperature and humidity, cooperative traffic...those and other factors can combine to provide a high number. If it repeats a few times, or, as you mention, it shows in improved full tank FE, then you've got something to talk about. And I'd say the same thing if you'd gotten 40 MPG instead of 60.
Thank you. Totally agree. Has there been any discussion about what the car does to prepare for a regen? I've read a few threads here and there but seems to remain unclear.

I also think the blend, like you mentioned earlier plays into FE. I don't have a clue if south FL receives winter blends but I'm betting they don't as majority of fuel enters the state or at least the southern part of the state via barge (Port Everglades). And what comes into the state remains in the state, no need for winter blends when the low is 45F, but refinement likely takes place in a refinery where winter blends are produced for the rest of the country.

Hoping we move on and have some productive comments about the theories for spikes on routine commutes. But likely won't happen as the thread purpose has been buried by pre-mature MFU worth comments.

Maybe next time.
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Old April 12th, 2019, 06:01   #22
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Your question was posed incorrectly and should have read why the difference between readings when doing the same trip. Your initial post was phrased as you got exceptionally high mileage. Post 19 explains this better.
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Old April 12th, 2019, 18:03   #23
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Originally Posted by 15TDICommuter View Post
What real world number do you expect to see.?I don't understand why one 77 miles trip is dismissed as nothing. I've been logging and have already stated I understand that it's far different when logged in an app than what the car shows. But I'm hoping to gain insight on what others are seeing, if there is a rise in what the car computes there will be a rise in app finds as well.
Based on the instantaneous FE shown in the display on the dash, I get more than 60-80 mpg for about 5 miles on the way to work due to road conditions... slight downhill. Instantaneous FE estimate on the dash... cool. I get 25-35 mpg going the other way. Oh

Drive your 77 mile trip in the other direction. What FE do you get? These cars have limitations.

So what is the reality? Well, reality is AVERAGE mpg over time. You post/record number of miles at fillup, and number of miles driven. Then you do it again next time you fill up. Post this record, and I will believe it.

Follow the Fuelly link at bottom of my post. What you see is that the MPG shown on the dash is not your mpg. Not even the average (unless it is oddly accurate-they generally are not accurate). Even if you drove on perfect level pavement for 500 miles, the instantaneous FE shown on the dash may not be accurate. It is just a warning when you are pushing too hard, and friendly news when you are not pushing hard, or losing altitude! One must be realistic.
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Old April 12th, 2019, 20:02   #24
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Based on the instantaneous FE shown in the display on the dash, I get more than 60-80 mpg for about 5 miles on the way to work due to road conditions... slight downhill. Instantaneous FE estimate on the dash... cool. I get 25-35 mpg going the other way. Oh

Drive your 77 mile trip in the other direction. What FE do you get? These cars have limitations.

So what is the reality? Well, reality is AVERAGE mpg over time. You post/record number of miles at fillup, and number of miles driven. Then you do it again next time you fill up. Post this record, and I will believe it.

Follow the Fuelly link at bottom of my post. What you see is that the MPG shown on the dash is not your mpg. Not even the average (unless it is oddly accurate-they generally are not accurate). Even if you drove on perfect level pavement for 500 miles, the instantaneous FE shown on the dash may not be accurate. It is just a warning when you are pushing too hard, and friendly news when you are not pushing hard, or losing altitude! One must be realistic.
Sure, I understand. Same route is consistent, the point of my post was to determine why I randomly see spikes in FE displayed by the car and as I linked later in the post.

Like I've covered, I'm doing the same route and basically the same driving styles with consistent weather. When there is a spike of 5mpg or so, it's indicator of change somewhere.

Look at my fuelly and my opening post. I am 100% aware the car displays a 'worthless' number, but as I'm learning by majority of the comments members are dismissing those numbers and not looking at it as a indication.

12k miles over the same route 5 days a week, I know the normal number. When you see a spike or dip, I'm going to question it. It's south Florida, flat as can be. Traffic congestion plays more into FE, not sitting in traffic but nearly bumper to bumper traffic at highway speeds.

This is just like the prolonger cranking on cold start ups, just because the car eventually starts ups and runs, doesn't mean it's right.
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Old April 15th, 2019, 05:34   #25
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Just to stir the pot on this since the thread remains in place. Same route as the starting post but with rain today 64mph over the 77mph, car shows 61.1mpg.

YES- totally understand it's a inflated number. Likely to see a 50mpg hand calculated tank if the commute traffic and weather remains the same.

Anyone able to provide insight on the topic of winter blends and south Florida? Like mentioned before, this could be a cause to the spike in mileage.
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Old April 15th, 2019, 06:52   #26
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Just hit 60.9mpg, avg speed was 65mph over a 77 miles commute. Not sure how to upload a photo to prove this but figured we could get the conversation going in the meantime.
2015 GSW 44k with the DSG, morning South Florida commute. No drafting. Stock tune and 'fixed'
Yes - fully aware this number is more like 55mpg and not the 60.9 shown by the car. Yes- also understand it's one drive. Planning to fill up and see what my app shows, likely 50ish for this tank, given I don't sit in traffic on the way home.
Anyone finding surprising numbers?
Do you have phase 2 emissions completed? My wifes golf sportwagen saw a slight decrease in fuel economy after. My 2014 jetta manual had both phases done at the time of purchase, but mine is tuned so not a good example. I havent had to calibrate my MFD yet, and its typically 1mpg higher than hand calc. I suspect this number might be off more with a higher hand calc value, but ive never been able to take the car all highway for a tank yet to see. My commute every day is less than ideal as the car probably doesnt warm up fully (8 miles), but i've been able to average 43mpg tracked over 7k miles on fuelly...even through the winter.

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Old April 15th, 2019, 18:44   #27
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Do you have phase 2 emissions completed? My wifes golf sportwagen saw a slight decrease in fuel economy after. My 2014 jetta manual had both phases done at the time of purchase, but mine is tuned so not a good example. I havent had to calibrate my MFD yet, and its typically 1mpg higher than hand calc. I suspect this number might be off more with a higher hand calc value, but ive never been able to take the car all highway for a tank yet to see. My commute every day is less than ideal as the car probably doesnt warm up fully (8 miles), but i've been able to average 43mpg tracked over 7k miles on fuelly...even through the winter.

Yes car is fully fixed. I haven't dove into calibration of the MFD as I've been using fuelly for my hand calculated mpgs and using the car numbers as a indicatior.

Wow 8 miles is a short drive, I'm at 77ish one way. I'm sure you'd see better numbers if the car was actually able to get to temp and fully warmed up.
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Old April 16th, 2019, 04:53   #28
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Yes car is fully fixed. I haven't dove into calibration of the MFD as I've been using fuelly for my hand calculated mpgs and using the car numbers as a indicatior.
Wow 8 miles is a short drive, I'm at 77ish one way. I'm sure you'd see better numbers if the car was actually able to get to temp and fully warmed up.
Yep it could be worse but the GDE tune is doing exactly what was promised!
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Old April 16th, 2019, 07:41   #29
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stock 2015 Golf TDI 6 spd....


last tank 5.4L/100km pen on paper calculation... previous half dozen tanks have been about the same as well... I think the stations should be transitioning to summer diesel soon....

80% plus rural driving at 90-110kph with a couple stopsigns.... 20% semi urban driving as my daughter is learning to drive on it...
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