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Old 02-08-2017, 01:48 PM   #1 (permalink)
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Default Summer vs. Winter Mileage

On a 2010 2nd Gen Insight, is it normal to get about 125 miles less per tank in the winter, compared to the Summer time?

I live in Quebec, where winter can get pretty cold but I freak out when I get much less driving done on a full tank, compared to the Summer time.
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Old 02-08-2017, 10:41 PM   #2 (permalink)
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Anything that increases air density, electric load or heat load adversely affects mileage, e.g.:

Colder air is more dense requiring more fuel to maintain mixture.
Cold battery is essentially disabled providing almost no IMA function until battery warms to around 10-15C.
Increased heater use.
Increased defroster use.
Increased rear defroster use.
Longer periods of idling for warm up before driving.
etc.

Not sure about your 125 mi number because I don't know what you get, but a 20% hit to mileage in extreme cold isn't unexpected.
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Old 02-08-2017, 11:29 PM   #3 (permalink)
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Minus 6-8 MpG on my civic hybrid in winter. He Insights never touch snow.
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Old 02-09-2017, 12:03 AM   #4 (permalink)
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Where you are, I bet winter tires Get put on? Also, remember that tire pressures need to be adjusted going into and then out of winter. If you do not check them all the time, I bet they are getting really low. See cold air more dense above. As a Southern Californian, I never knew that until frequenting auto forums.
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Old 02-09-2017, 11:51 AM   #5 (permalink)
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I am in Quebec, Canada. Temp today is -15 Celsius and feels like -25 Celsius with wind.

I checked the tire pressure and added air a month ago.

I knew that air conditioning uses more gas in Summer but did not know that heater and defrost button uses more gas as well.

I was able to get 4.2 to 4.7 L/100km in the Summer but now, I am getting more 6.7 to 7.3 L/100 km. On the same full tank, I used to get 700 something km in Summer but in Winter, I get about 500 something.
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Old 02-09-2017, 01:40 PM   #6 (permalink)
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I'm in Wisconsin and my winter mileage is absolutely terrible this year. Do you have a Fuelly set up? It makes tracking a breeze.

Here's my last 7 fuel ups:
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Old 02-09-2017, 01:56 PM   #7 (permalink)
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First time I hear of Fuelly. Sounds cool.

I will install it on my phone and start using it, thanks for mentioning it
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Old 02-10-2017, 06:14 AM   #8 (permalink)
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Here in NJ, the fuel in winter is 18% butane, 10% alcohol, and 72 gasolene.

So fuel mileage < gas mileage due to fuel mixture plus all other effects.
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