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      03-31-2013, 12:54 PM   #1
cptJLPicard
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Winter vs summer fuel consumption

The other day one of my friends asked me if now, with warmer weather, I see any change in fuel consumption. His ride is a 2008 Cadillac CTS 3.6 - mine 135i. My answer: no change for me, never had, summer/winter I get and avg of 9.4, mixed hwy and city. He does get a better millage now, with spring here.

So, what is your experience? And, if you do see a diff, what would you say is the reason (assuming a consistent way of driving... )?
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      03-31-2013, 03:03 PM   #2
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I never pay close enough attention.
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      04-02-2013, 09:03 AM   #3
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Technically I get better mpg from summer gas.

But once I get summer tires on I spend more time with the pedal to the floor than not, so my mpg goes way down.
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      04-02-2013, 09:50 AM   #4
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With my old diesel i noticed a huge difference since they would put anti gelling chemicals in. usually about 5mpg(down from 25-20). With my bimmer, i notice zero different. 23-25mpg 80% highway always using the same mobil 93 octane.
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      04-02-2013, 08:21 PM   #5
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Quote:
Originally Posted by paradoxical3 View Post
Technically I get better mpg from summer gas.

But once I get summer tires on I spend more time with the pedal to the floor than not, so my mpg goes way down.
LOL +1
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      04-02-2013, 08:24 PM   #6
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Quote:
Originally Posted by 631twentyeighteye View Post
With my old diesel i noticed a huge difference since they would put anti gelling chemicals in. usually about 5mpg(down from 25-20). With my bimmer, i notice zero different. 23-25mpg 80% highway always using the same mobil 93 octane.
My wife drives a 2005 vw golf diesel (guess what car is sitting on the driveway ) - zero difference
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      04-02-2013, 09:01 PM   #7
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I mean a old school(and my own personal favorite) common rail diesel, not the TDI's. It was a 2.8 4 cyl turbo diesel from vm motori in a 06 liberty. Most reliable car my family has ever owned.
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      04-03-2013, 02:44 AM   #8
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2 things happen during winter

1: air is colder, so interooler is much more effective, meaning engine can use more timing advance and get more power from the same amount of a given octane fuel

2: air is colder, so engine takes longer to warm up, using more fuel

additionally for me:

3: winter tires go on, they are thinner, better gas mileage
4: winter tires go on, they have more rolling resistance, better gas mileage cancelled out
5: winter conditions mean driving slower about 15% of the time, gas mileage goes way up, but can go down if the snow is deep enough

since i drive longer distances, 2 is inconsequential, and 1 helps, and 5 generally improves trip econ by 20%

my N54 mileage this winter was identical to that during the summer
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      04-03-2013, 06:20 PM   #9
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3 mpg...
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      04-11-2013, 11:01 AM   #10
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During the winter it burns more fuel for me. Depending of course on the definition of winter and summer.
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      04-11-2013, 12:30 PM   #11
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I track every mile and gallon used on fuelly.com. In my Jetta TDI wagon I average about 4-5 mpg less in the winter months. Once it gets back above 40 degrees I start to see 40mpg again. Never in the winter. I usually get 36-37 mpg during the winter months. This is in tracking 35000 miles.
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