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Old 11-13-2014, 08:28 PM
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Winter fuel consumption.

Hello,

Could someone please explain why in the winter my new 2014 3.6L Pentastar engine consumes more fuel that it would during warmer months?

Tnx.

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Old 11-13-2014, 08:39 PM   #2
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Depending on what part of the country you live in the fuel blend is changed for cold weather and has more chemicals added for freezing. This in turn displaces fuel to burn and the sacrifice is mpg. Also in cold air there is more air and to compensate the engines computers add fuel to balance the air/fuel ratio.
Or so I've been told. Could be wrong. I'll wait to hear what others say.

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Old 11-13-2014, 08:46 PM   #3
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I think winter blend fuel is oxygenated to help cut down on pollution so less real gas =less mpg.
I copied this off another site written by someone who is way smarter than me.
"Here's the poop: As specified by state law, reformulated winter gas contains any number of lighter, lower-boiling-point hydrocarbons (butane, propane, etc.) that just so happen to have an excellent octane value. Added to this may be any number of oxygen-bearing ether compounds (MTBE, ETBE, ethanol) that improve emissions and also have a relatively high octane blending value."
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Old 11-13-2014, 08:50 PM   #4
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I think winter blend fuel is oxygenated to help cut down on pollution so less real gas =less mpg. I copied this off another site written by someone who is way smarter than me. "Here's the poop: As specified by state law, reformulated winter gas contains any number of lighter, lower-boiling-point hydrocarbons (butane, propane, etc.) that just so happen to have an excellent octane value. Added to this may be any number of oxygen-bearing ether compounds (MTBE, ETBE, ethanol) that improve emissions and also have a relatively high octane blending value."
In short, what he posted. Winter fuel and winter mileage sucks. Idling to warm it up doesn't help matters either.
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Old 11-13-2014, 09:21 PM
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So, technically, we get less bang for the buck during winter months... Petrol companies must love winter...
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Old 11-13-2014, 09:22 PM   #6
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So, technically, we get less bang for the buck during winter months... Petrol companies must love winter...
That about sums it up for me.
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Old 11-13-2014, 09:24 PM
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Depending on what part of the country you live in the fuel blend is changed for cold weather and has more chemicals added for freezing. This in turn displaces fuel to burn and the sacrifice is mpg. Also in cold air there is more air and to compensate the engines computers add fuel to balance the air/fuel ratio.
Or so I've been told. Could be wrong. I'll wait to hear what others say.
If there is more air in cold air, then there must be more fuel in cold fuel either, thus there should be no need for compensation...IMHO
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Old 11-14-2014, 06:05 AM   #8
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If there is more air in cold air, then there must be more fuel in cold fuel either, thus there should be no need for compensation...IMHO
Wrong, gases can be compresses, fluids can't!!!
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Old 11-14-2014, 06:12 AM   #9
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Wrong, gases can be compresses, fluids can't!!!
True
More air = more hp potential
This can come from colder denser air (think intercooler on turbo cars vs hot air) or altitude. The higher the altitude less air density and less hp.
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Old 11-14-2014, 06:50 AM   #10
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Also time to warm up, also all involved in the drive train is harder to turn until they get to their operating temperature. So, on long trips you will see minimal difference, but it kills on short trips.
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Old 11-14-2014, 09:42 AM   #11
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So, technically, we get less bang for the buck during winter months... Petrol companies must love winter...

They prefer summer. More people are driving and demand is up. Increased demand means higher prices and higher profit.
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Old 11-14-2014, 09:54 AM
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They prefer summer. More people are driving and demand is up. Increased demand means higher prices and higher profit.
In this case, I'd just say that they always win...
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Old 11-14-2014, 11:25 AM   #13
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The dreaded winter blend is not regional per se. It is distributed across the US. The formulation may be regional but we all get the privilege of using it.
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Old 11-14-2014, 06:27 PM   #14
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Just what I saw the past couple weeks in Eastern Pa...Today, for regular was $2.899 per gallon, Shell brand, but I've been seeing my mileage down to around 16 MPG... I always know when they switch the blend ( Fall time) because my mileage dips....So, the price of fuel drops, but so does the MPG!.....Lower prices at the pumps, but lower MPG....Kind of a no brainer for the oil industry...As we say at work Win, Win Situation for the refineries.
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Old 11-14-2014, 09:43 PM
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Just what I saw the past couple weeks in Eastern Pa...Today, for regular was $2.899 per gallon, Shell brand, but I've been seeing my mileage down to around 16 MPG... I always know when they switch the blend ( Fall time) because my mileage dips....So, the price of fuel drops, but so does the MPG!.....Lower prices at the pumps, but lower MPG....Kind of a no brainer for the oil industry...As we say at work Win, Win Situation for the refineries.
Hey Ed,
I've noticed the MPG dip as well, that's one of the reasons why I've started the thread...
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Old 11-15-2014, 03:18 PM   #16
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Based on my mileage record, I'm pretty sure they changed over at the beginning of Oct. I was regularly running mid/upper-14MPG, but have since dropped to low/mid 13s.

Par for the course, I guess. Doesn't make the wallet feel any better, but then again I didn't buy this beast to set MPG records.
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Old 11-17-2014, 09:42 AM   #17
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The winter fuel sucks big nuts I just fueled up on fri said the tank was full I haven't even gone a hundred miles on the tank and I'm just about to a half a tank this blows !!
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Old 11-17-2014, 10:25 AM   #18
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I noticed my mileage on my JK dropping about 2-3 MPG starting sometime in October here in Washington state. What would be interesting to know is how localized the winter blends of fuel are. The climate on the west side of WA is quite a bit milder than the east side. I can understand a higher volatile fuel for starting in below zero temps in eastern WA, but most of our temps rarely get below freezing.
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Old 11-17-2014, 11:02 AM   #19
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I was wondering about this. I noticed my MPG drop from an average of 16 to 14.4 over the last two weeks. Oh well, gas is usually pretty cheap in Oklahoma. Paid $2.41 last Friday in OKC.
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Old 11-17-2014, 03:11 PM   #20
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You guys are making me jealous, I would take an 8mpg hit for those gas prices! And would still come out ahead! Up here near Toronto gas is as cheap as I have seen it in a long time and it's still $1.07/L (about $4.05/gal). I need to find one of those big farming fuel containers and head down south for a visit!
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Old 11-17-2014, 03:23 PM   #21
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You guys are making me jealous, I would take an 8mpg hit for those gas prices! And would still come out ahead! Up here near Toronto gas is as cheap as I have seen it in a long time and it's still $1.07/L (about $4.05/gal). I need to find one of those big farming fuel containers and head down south for a visit!
We have the advantage of being close to the source and I also look out of my office window over a refinery. So we usually have it pretty good in Oklahoma. Come on down with a fuel tanker any time!
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Old 11-17-2014, 03:23 PM   #22
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Interesting post I didn't know about winter fuel and I noticed about a 2 1/2 mpg drop in the last few weeks. But also fuel does drop in price in the winter alittle, atleast here in NYC. It's probably gone down about 20-30 cents a gallon since the summer so over all you may not lose out too much in the long run
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Old 11-17-2014, 03:26 PM   #23
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I was wondering about this. I noticed my MPG drop from an average of 16 to 14.4 over the last two weeks. Oh well, gas is usually pretty cheap in Oklahoma. Paid $2.41 last Friday in OKC.
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Old 11-17-2014, 03:35 PM   #24
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Haha, if it makes you feel better I fill my 22.5 gallon tank up twice a week. Living in OK does have its perks but you have to put up with 50 degree temp swings in a day, tornados and about 2-3 earthquakes a day now so there are always compromises to be made.
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Old 11-17-2014, 03:46 PM   #25
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so you have less volatile fuel, more resistance due to cold temp effect on lubrication and richer fuel mix to a cold engine (comparable to the choke staying on longer in the winter on the older engines)...it's a wonder the drop in MPG isn't more.
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Old 11-17-2014, 03:55 PM   #26
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so you have less volatile fuel, more resistance due to cold temp effect on lubrication and richer fuel mix to a cold engine (comparable to the choke staying on longer in the winter on the older engines)...it's a wonder the drop in MPG isn't more.
If it's less volatile wouldn't that make the octane higher
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Old 11-17-2014, 06:19 PM   #27
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If it's less volatile wouldn't that make the octane higher
There is no contradiction in his statement. What he says is true.

All things being equal, colder temperatures should produce more hp due to higher oxygen content in the denser air, particularly once the engine is up to temp (the range of potential volume for air/fuel mixture as it burns within the combustion chamber is greater when air/fuel mixture is cold). An internal combustion engine is effectively an air pump. Anything that makes it breathe better will make it more efficient. Unfortunately, all things are not equal.
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Old 11-17-2014, 07:34 PM   #28
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True More air = more hp potential This can come from colder denser air (think intercooler on turbo cars vs hot air) or altitude. The higher the altitude less air density and less hp.
I have been saying that since the beginning of the thread.
Cold air is more dense and can make more power if the engine is tuned for it. IE more fuel and more timing. Thanks to modern fuel injections with mass air meters and oxygen sensors it is done for you. Older carb cars needed to be jetted for temperature and density changes.
As stated engines are air pumps.
Suck squeeze bang blow (4 cycle)
Do this with the most efficiency and you will make more power.
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Old 11-17-2014, 08:41 PM   #29
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Colder, denser air requires more gas to maintain the air/fuel ratio.
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Old 11-18-2014, 04:38 AM   #30
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Four reason for less fuel mileage:

1. The winter blend of fuels used.
2. Time spent warming up your Wrangler.
3. Oil's are thicker, so you have more parasitic HP loss.
4. Your tire pressure, will average lower PSI, along with your tire rubber being stiffer, (more roll resistance).

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