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Old 11-30-2015, 06:30 PM   #111
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Got me curious - found this at https://www.fueleconomy.gov/feg/coldweather.shtml:
Why is winter fuel economy lower?

Cold weather affects your vehicle in more ways than you might expect:
  • Engine and transmission friction increases in cold temperatures due to cold engine oil and other drive-line fluids.
  • It takes longer for your engine to reach its most fuel-efficient temperature. This affects shorter trips more, since your car spends more of your trip at less-than-optimal temperatures.
  • Heated seats, window defrosters, and heater fans use additional power.
  • Warming up your vehicle before you start your trip lowers your fuel economy—idling gets 0 miles per gallon.
  • Colder air is denser, increasing aerodynamic drag on your vehicle, especially at highway speeds.
  • Tire pressure decreases in colder temperatures, increasing rolling resistance.
  • Winter grades of gasoline can have slightly less energy per gallon than summer blends.
  • Battery performance decreases in cold weather, making it harder for your alternator to keep your battery charged. This also affects the performance of the regenerative braking system on hybrids.
  • In severe winter weather, your mpg can drop even further.
  • Icy or snow-covered roads decrease your tires' grip on the road, wasting energy.
  • Safe driving speeds on slick roads can be much lower than normal, further reducing fuel economy, especially at speeds below 30 to 40 mph.
  • Using four-wheel drive uses more fuel.
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Old 11-30-2015, 06:40 PM   #112
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Originally Posted by padlin View Post
Greg
Here's a quote I found. "cold air is denser, which increases the drag on a vehicle". Do southern states get stuck with winter gas?
Hi: padlin... That must mean that "Hot Air" like that found here is better for towing... but E85 not so!!! Alf
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Old 11-30-2015, 07:05 PM   #113
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OK it's down to a coin flip.
Consumers Report - 80+ years old and over 1 million subscribers that pay for their opinion?

Or the person on the Escape Forum who has an opinion on everything and says I shouldn't trust them?

My family has had CR in the magazine rack since I was born (1949) and my Mom paid for my subscription as a Christmas gift for years. Not the only information I use to make decisions but it's definitely a 'trusted' opinion for consideration.
Could not agree more. Forty years of EXPERIENCE in the automotive repair business has led me to be in agreement with the reliability ratings from Consumer Reports.
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Old 11-30-2015, 07:24 PM   #114
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Interesting on the cold temps affecting mileage. Never being in the cold temps much I've not experienced the drop, but points presented makes sense as the mileage improved as the temperature improved.
Then of course, there's Alf and his hot air theory.
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Old 11-30-2015, 07:30 PM   #115
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Then of course, there's Alf and his hot air theory.
He gets a lot of mileage out of that.
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Old 11-30-2015, 07:36 PM   #116
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OK it's down to a coin flip.
Consumers Report - 80+ years old and over 1 million subscribers that pay for their opinion?

Or the person on the Escape Forum who has an opinion on everything and says I shouldn't trust them?
I would consider CR's reports, too... for the purchase of a home appliance, which is most of their business.

I have lots of opinions, and my reasons for them (which are never a coin flip); of course there are many things (including thousands of topics in this forum) for which I have no opinion. I hope every intelligent adult has lots of opinions, in their areas of interest, and their own reasons. I'm happy to hear their reasons. If anyone is not interested in my reasons, they need not read them, let alone comment on them.

I'm not telling anyone who to trust - you need to make your own decisions, which will very often be different from mine.

One more CR anecdote: in a "news" article which is really a driving impression column, one of their engineers described the Ford 2.7L EcoBoost performance as "cheating physics". If he doesn't understand the principles of physics on which turbocharging is based, or how direct injection enables turbocharging with high compression ratio, then he should not claim to be qualified as an engineer... in my opinion.
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Old 11-30-2015, 07:38 PM   #117
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"I wonder why they need to ask so may detailed questions - wouldn't "what has broken that you had to have fixed" kind of cover it? I hope they are just trying to categorize responses, rather than to ask owners to assess how good each component might be (which would be subjective)."

Yes, Consumer Reports does break the results down by category so prospective buyers can see exactly where the problem areas are.


"That count includes all makes and models, so only a small fraction would be of a particular model/generation, and only a tiny fraction in the case of a new model."

Consumer Reports requires a minimum of 100 samples for every make and model for every year reported on. Most makes and models would have many times that number, running into the thousands for more popular makes and models.


"CR is only surveying a small fraction of them. That's why their survey only covers much less than one percent of all vehicles in North America."

Yes, but it's still the largest sampling, (by far), in existence.


"The next challenge: who answers? Just like the political polls which are so often so very wrong, the answers are skewed by who choses to respond to the survey. The results for any one of the newer vehicles could be based on a few dozen responses, and likely from the people who have some reason to be most interested in vehicle failures. This is certainly better than asking on buddy how his new truck is working out, but I'd say it's pretty much still anecdotal."

Of course, but it is a level playing field for all brands.


"So, it couldn't hurt to look at Consumer Reports, but I wouldn't put any faith in what they say."

I'd put much more faith in what they say than in what one individual has to say.
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Old 11-30-2015, 08:39 PM   #118
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Maybe someone who is towing vehicle knowledgeable can figure this one out. When towing the new 19 with our 2014 Nissan Frontier(factory tow package) up in the Seattle, OR, ID area with temps at 25 high 12 low we were getting a miserable 10-11 MPG. Once we turned S on NV 93 and got below Jackpot which broke the low temps we started getting closer to 13 MPG. Below Ely to Las Vegas mileage went up over 14 MPG and back in AZ got close to 15 MPG. What's up with that??
Could elevation have anything to do with your mileage difference? I'm not talking about going up and down hills, but the air...
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Old 11-30-2015, 11:31 PM   #119
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I guess it could Donna, but we got 10-11 driving between Lynden Wa and Seattle and that shouldn't have been at altitude. The Snoqualimie to Twin Falls run definitely had some altitude vs Vegas and AZ.
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Old 12-01-2015, 02:46 AM   #120
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Maybe someone who is towing vehicle knowledgeable can figure this one out. When towing the new 19 with our 2014 Nissan Frontier(factory tow package) up in the Seattle, OR, ID area with temps at 25 high 12 low we were getting a miserable 10-11 MPG. Once we turned S on NV 93 and got below Jackpot which broke the low temps we started getting closer to 13 MPG. Below Ely to Las Vegas mileage went up over 14 MPG and back in AZ got close to 15 MPG. What's up with that??
I am guessing speed.
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