Mileage and weather

Alana · May 4, 2015

Bought the TDI in November and it only has 6k on it, so I can't say I have a full years worth of data.

That said, all winter I noticed the mileage was 2-3mpg better on days when it was broadly above freezing leaving the house than when it wasn't. It's the same again now it's over 50 degrees. I'm literally getting 5-6mpg better than I was in the winter.

Anyone else notice this disparity?
This is on a roughly 18mile drive mixed urban and highway.

fincher · May 4, 2015

Yes, though not to the degree you describe. Plus, we are using a diesel with the 'summer blend' now. When it's gets hot and the AC is working hard, the mileage will go down a bit.

Getting 26-27avg with 75% highway.

Jimbuffalo · May 4, 2015

winter fuel returns fewer MPGs....I've 28000 miles and tracked every fill up for the first 22k miles...26.5 mpg overall...winter spring summer fall city highway towing or not....it all balances out.

Alana · May 5, 2015

You didn't read my post.
The mileage differed significantly depending on whether it was warmer or not, on the same tank of gas.

hedditch · May 5, 2015

Alana said:
You didn't read my post.
The mileage differed significantly depending on whether it was warmer or not, on the same tank of gas.

It sounds suspect, may be a need for a dianotic scan with VCDS or VAS. If something as noticeable as this is happening i would expect to see an error lamp on the dash. What do you refer to as a hot v's cold day?

Stuart..

Waterclown · May 5, 2015

I have a 2013 tdi and it make a big difference in mpg going from below 0 deg to above freezing. A few mpg for sure. That's driving 15 miles one way for work. The drivetrain is just getting warmed.

Alana · May 5, 2015

Temperature difference of 30F is sufficient to make a noticeable difference.
0-30 and 30-60 both show this. It was 80 today driving home and that was the same as 60

Waterclown · May 5, 2015

Alana said:
Temperature difference of 30F is sufficient to make a noticeable difference.
0-30 and 30-60 both show this. It was 80 today driving home and that was the same as 60

Seems normal. I see the same.

Alana · May 6, 2015

Didn't realise it was so susceptible to temperature change. The gasoline one wasn't nearly as sensitive.

old bear · May 8, 2015

Two issues-(1) vehicle does respond to temp variations; (2) Winter diesel (or #1 diesel) does not have the same BTU's as regular #2 diesel, hence less power and more fuel consumption.

Mileage and weather

Alana

fincher

Jimbuffalo

Alana

hedditch

Waterclown

Alana

Waterclown

Alana

old bear

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