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MPG drop in winter

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  #1 (permalink)  
Old 17 Dec 2010, 11:06 pm
edb edb is offline
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Join Date: Jul 2010
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Default MPG drop in winter

I have a 2003 PT limited edition, this is its first winter with me. My pt was doing 20-21mpg before December; but in December, after temperature drops significantly, it was doing 16-17 mpg.

That's more than 20% drop. Is this normal?
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  #2 (permalink)  
Old 18 Dec 2010, 04:59 am
Young Cruiser
Join Date: Oct 2010
Location: London, Ontario, Canada
Posts: 66
Default Re: MPG drop in winter

My winterbeater has gone from averaging 30mpg for the three weeks prior to our snowfall, to an average of 26mpg since snow has moved in.

Do you have snow or just cold temps, and have you switched car over to snow/ice tires from all seasons?

Last edited by Lakota; 18 Dec 2010 at 05:02 am.
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Old 18 Dec 2010, 10:15 am
Regular Cruiser
Join Date: Sep 2010
Location: Tulsa Oklahoma
Posts: 115
Default Re: MPG drop in winter

What you are seeing is the effect of the computer enrichening the fuel mixture and increasing the idle to compensate for the cold weather. Older cars had a choke on the carb that set when you stepped down on the throttle and gradually reset as the engine warmed up and if you have been around a long time like myself you drove cars that you actually pulled a mechanical choke lever on or under the dash to set the choke. As long as the weather is cold you are going to notice a decrease in mileage but it's perfectly normal. It's a bulletproof system and works very well.
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Old 18 Dec 2010, 11:16 am
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Default Re: MPG drop in winter

Also, the gas companies change their mixture in the winter time which results in lower gas mileage.

What’s the difference between summer-blend gasoline and winter-blend gasoline? -
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  #5 (permalink)  
Old 18 Dec 2010, 12:02 pm
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Location: Hampton roads Va.
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Exclamation Re: MPG drop in winter

all year long i had been doing around 23-24 mpg and this month its droped i knew something was causing this to happen and remember what crewzin just stated, there fuel mix really sucks
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Old 18 Dec 2010, 08:11 pm
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Join Date: Nov 2010
Location: Innisfil Ontario Canada
Posts: 372
Default Re: MPG drop in winter

I don't know if it's the same South of the border,but, up here right on the gas pumps it states."volume corrected to 15C" or something very close to that,so in winter they get away with selling a bit less than you pay for. That's the way I see it anyway..
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Old 19 Dec 2010, 03:14 am
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Join Date: Dec 2010
Posts: 32
Default Re: MPG drop in winter

Do not forget that people leave vehicles running 10 to 15 minutes or longer to warm up before driving.
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