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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old January 21st, 2018, 17:03   #1
Maddawg
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Join Date: Oct 2017
Location: Strathroy Ontario Canada
Fuel Economy: 800 kms per tank in summer
Default Lost 200kms per tank in cold southern Ontario

I'm losing 200 km per tank this winter I haven't changed my driving habits at all. I'm assuming it has to do with the cold. This is my first diesel
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Old January 21st, 2018, 18:36   #2
narongc73
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if it's short trips, that's about right
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Old January 21st, 2018, 18:39   #3
Vince Waldon
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You can expect in the neighborhood of a 10-15% loss in the winter due to increased tire rolling resistance (especially if you use winter tires) thru snow, increased idling, greater electrical load on the engine (lights, heater fan, rear window defroster), cold temperature effects on grease, and in particular the fact that the fuel companies switch to an anti-gel diesel formulation that has less energy per liter.

That said, 200km sounds a bit on the edge...if it doesn't get better in the spring you may want to investigate further if you don't have time now.

A dragging emergency brake is a pretty common cause of a steep drop in fuel economy, for example. Timing that's off, air filter over-due for replacement... several other things to check.
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Old January 22nd, 2018, 03:09   #4
Tdijarhead
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I loose 100 miles per tank during the winter. Around 750 to 650. I’ve come to the conclusion after running an ultragauge on my car during operation that it’s the cold. It doesn’t allow your vehicle to warm up as quick and keep the optimum operating temperature as consistently.
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Old January 22nd, 2018, 04:54   #5
vincej
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Mine uses about an extra 1/2 liter per 100 kms in the winter. That number would surely be more if the car was parked outside or sustained temperatures would go below -20C.
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Old January 26th, 2018, 04:35   #6
UhOh
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200km seems a little on the high side to blame only on temperatures and fuel.

E-brakes tend to become a bit troublesome in cold weather. Verify that your rear brakes aren't sticking.
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Old January 26th, 2018, 05:35   #7
csstevej
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Also verify that the coolant temp sensor and thermostat are working correctly. Those will rob you in fuel efficiency too.
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Old January 26th, 2018, 05:36   #8
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Need to verify with at least a laser thermometer but better yet with VCDS.
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Old January 28th, 2018, 05:51   #9
dandywriter
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What tire pressure are you running? Checked recently?

http://www.nrcan.gc.ca/energy/effici...s/buying/16748
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Old January 29th, 2018, 09:57   #10
pedroYUL
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Let me add to the laundry list: wheel bearings, some might not get noisy when failing and create extra friction that is worst when cold.

Is you car still on the original wheel bearings?
If changed, were they quality replacements?

Both my cars have now new wheel bearings in all 4 corners, some SKF, some Optimal...they roll like a dream now!
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Old January 29th, 2018, 11:31   #11
2015vwgolfdiesel
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Quote:
Originally Posted by Maddawg View Post
I'm losing 200 km per tank this winter I haven't changed my driving habits at all. I'm assuming it has to do with the cold. This is my first diesel


My 2015 Golf TDi is down ... some ... But Tulsa is a long way from that much cold temps
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Old January 29th, 2018, 15:44   #12
fruitcakesa
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My last tank was 37.1 and that was with extended parked time during the super cold snap and short duration minimal warmup runs with a few highway trips in between the rest of the time.
That is high for this car in cold temps. It would be higher yet with fewer local hauls and more highway time.
We used the Honda during the snap and it averaged only 30 mpg or lower down from 40.
Extreme cold is really tough on all ICE
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Old February 6th, 2018, 06:55   #13
2015vwgolfdiesel
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Quote:
Originally Posted by fruitcakesa View Post
My last tank was 37.1 and that was with extended parked time during the super cold snap and short duration minimal warmup runs with a few highway trips in between the rest of the time.
That is high for this car in cold temps. It would be higher yet with fewer local hauls and more highway time.



We used the Honda during the snap and it averaged only 30 mpg or lower down from 40.



Extreme cold is really tough on all ICE
I really never thought that much about this issue.

Good to know.
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