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I've spent the majority of the winters I've lived through in places where it drops below at least one of the zeroes, and I've never added anything to the tank, so, to me, it sounds like a scam.
AIRI, petrol (gasoline) has to go well below -40 to freeze. It only needs to go a few degrees below to be a problem for diesel, but that's taken into account when diesel cars are designed.
I wanna be a eunuchs developer! Pass me a bread knife!
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The concern is water in the fuel condensing out and freezing within the fuel lines. HEET is made of alcohol (methyl or isopropyl) which does absorb water and prevent freezing.
Over the last 20 years we have added ethanol to the gas which also absorbs water, so IMHO the solution is built in.
Diesel is a different story in that the fuel gels up. The blends are altered seasonally to counter that. And of course there are additives you can buy.
Director of Transmogrification Services
Shinobi of Query Language
Master of Yoda Conditional
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I would fill your tank with gasoline, the freezing point is much lower than diesel's.
Also do not believe everything on the internet.
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Rage wrote: do not believe everything on the internet.
OK. I believe you.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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The only time I've needed fuel additives is on a couple of large capacity V-Twin carbureted motorcycles, where you can get a phenomenon called "Carb Icing" where the atmospheric moisture freezes onto the carb jets and blocks the fuel flow. This means that when you shut the throttle after a period of running the carb blocks and all the cylinders it feeds die. Very annoying and a little dangerous, but not a real problem.
"Normal" petrol (or Gas) freezes at -60C (-76F) so you will have bigger problems than your car if it gets that low ... Diesel freezes at around -8C (17 °F) so that may be a problem.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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I haven't had any problem with any car (diesel or petrol) by temperatures below -10°C without additives in fuel.
Battery chargers and water for the wipers is another story, though.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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The key ingredient in Heet is isopropanol, when added to water, it lowers the freezing point of the water. [linky[^]] Seafoam also has isopropanol as an ingredient although not in as high as a concentration so the freezing point would not be as low unless you add more. Contrary to what the other posters above had stated, putting Seafoam in the gas tank is one of the intended use cases for Seafoam [linky[^]]. I have done this successfully as part of the maintenance routine on the recommendation of my mechanic who is ASA certified as part of my winterization routine. I have not had any issues starting my vehicle for years. Today it is -15 for my drive into work, brrr.
It was broke, so I fixed it.
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S Houghtelin wrote: Contrary to what the other posters above had stated, putting Seafoam in the gas tank is one of the intended use cases for Seafoam
For clarification, my post regarding this as not an intended use is not about putting SeaFoam in the tank; it is about using SeaFoam as a fuel-line-antifreeze
Director of Transmogrification Services
Shinobi of Query Language
Master of Yoda Conditional
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"Director of Transmogrification Services" ---- where exactly do you work? 
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Last employer contracted all sorts of DB work for me, having me import the ugliest things known to man... As well as doing DTS packages on SQL 2000
So my first business card for them had Director of Transmogrification Services as my title.
Second card was "Death Defying Database Dude"
Director of Transmogrification Services
Shinobi of Query Language
Master of Yoda Conditional
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Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Read in the paper this morning that y'all are going to get blasted. Stay safe!
Got my site back up after my time in the woods!
JaxCoder.com
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The gasoline in your tank isn't going to freeze. The water that hasn't mixed with it, might. And if it freezes and plugs a fuel line or filter, then yeah, you'll have problems. If the gas in your state has ethanol in it (don't most, nowdays?), then the heet isn't even needed as any water already mixed with the ethanol in the gas and passed through the system long ago.
Now, if you were talking diesel, then its a different story.. and heet isn't the right solution there.
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Thank you one and all for your response(s)
Made through the first night of negative twenty seven
Will I awaken alive ? Will the car start ?
We'll know after tonight's negative thirty two.
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Where are you that it's negative 27? Wind chill doesn't count on cars.
By now, you probably know if your battery is up to snuff
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Wisconsin.
Supposedly colder than Antarctica that week; local gossip; nothing confirmed by any source I acknowledge at this time.
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Please report status
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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charlieg wrote: Please report status
I believe we hit 30 below zero; possibly 32.
Took my chances.
Gasoline did not freeze.
Battery struggled, but did start the car.
I had windshield washer fluid which advertised negative twenty degrees on its label.
It froze at negative 30 (I will remain satisfied with the product).
Seems the one effective way of de-icing the windshield is to...
- Start the car
- Turn the defroster onto blast-o-max-o
- Wait a long time
Expensive, but it seems to be the one thing that works.
Too bad they won't put that rear window de-icing circuit thing on the other windows.
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C-P-User-3 wrote: Seems the one effective way of de-icing the windshield is to...
- Start the car
- Turn the defroster onto blast-o-max-o
- Wait a long time
I always just used an ice scraper. That's what the things are for. Every filling station and grocery store sells them. Auto parts stores too, if you're really having trouble finding one. Heck, even Target sells them (and even in places that almost never need them, too).
As for windshield wiper fluid freezing, yeah, -30 is darn cold. You could try adding HEET to it , but truthfully, at -30 you probably don't want to be squirting any liquid on your windshield anyway.
Also, at those kinds of temps, you gotta start worrying about the antifreeze in the engine. As I recall, it isn't typically mixed to sustain such low temps.
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About the only time I travelled "up north" on a regular basis, two of my boys were involved in travel ice hockey. Most of the time, the weather was bearable - cold but sunny, temps around 10-25. There were a few trips my wife took to Sarnia at the south end of Lake Huron. Amazing amounts of snow piled up by the plows - 30+ feet.
One thing we noticed - seemed the cars up north warm up faster and put out more heat. The other thing - people actually put their cars in garages (those that have them).
Last week it was 75 here in Atlanta. Nope, not moving north
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Many years ago (like, around 1980) I read a philosophical dissertation about the concept of holes, being the defined by the abscence of "something", their existence defined by something outside themselves which is definitely not part of the hole, yet that which defines it...
You might think that this is a trivial matter, but this dissertation showed that it is certainly not.
My problem is that I have lost my copy. At least, I am unable to find it in my half a ton of old xerox copies in the basement. Does the issue ring a bell? Can anyone help me to a link, or even a reference to a paper copy of this dissertation?
(As far as I remember, my copy was a xerox of a friend's xerox, so without the copy at hand I cannot give any hint about the source.)
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Not a philosophical definition, but there is a similar concept in Semi-conductors
hole
"Time flies like an arrow. Fruit flies like a banana."
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I recall some science papers and tangental philosophies that were based on a reversion of Einstein's problematic "hole argument" when he was working on general relativity.
If I recall correctly, it comes down the simple fact that a "hole" in something is simply a 3D object, and that object is within another object... so if know that parent object we know about the children within, so we can determine what the hole is or is not.
But I don't have a copy of that, just some term papers I did on Einstein back in school
Director of Transmogrification Services
Shinobi of Query Language
Master of Yoda Conditional
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So...your paper went down in a black hole?
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Just this. I was intending the same pun.
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