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File: 38c68c5466aa328⋯.jpg (241 KB, 500x400, 5:4, gas.jpg)


Why do many of the signs for fuel have the gas price colored red and the diesel price colored green? Red means stop and green means go, so should we stop buying gas and encourage truckers to buy more diesel? I only noticed this after moving from one city to the suburbs of another city.



Autism summarized in a single post.


Cool thread. I'll speculate that red is associated with gas because modern EPA-mandated gas cans are red (used to be unpainted grey metal or army green/brown/black AFAIK). They're red because gasoline is dangerous to store (flammable, explosive, toxic fumes). Diesel is much safer in storage, cans are typically yellow, but I suppose gas stations use green for contrast.



In this particular case I suspect it is because the diesel is more expensive. People tend to prefer green things because red is "stop". So if you drive a diesel and just glance at the signpost you don't notice the price discrepancy because your brain filters out the red stuff.

Next time you see one, try to focus your attention on both of the numbers at once. You'll find that your brain wants to look at either all the red crap (there is usually more than 1 type of petrol where I live, at least) or all the green crap but not both at once.


Is diesel better than gas? I always wondered why diesel is an option when all the cars are gas. Why are there only diesel trucks and trains?


Red and green are the two most distinguishable colours due to our hunter gatherer based evolution. Where we were looking for red fruits among green leaves.



Are you fucking serious? You've never heard of diesel cars?



>Are you fucking serious? You've never heard of diesel cars?

They dont have many diesel cars outside the EU because its a very dirty fuel source.

Its mostly an EU thing. Where the EU pretended diesel was better to push European cars on everyone.

Recently its been revealed that they were systematically cheating the emissions tests.



You mean the Germans in VW. "The EU" isn't a country, though the bureaucrats in Brussels sure seem to want it to be.


Diesel is more energy dense and less volatile. It is used in engines where the fuel is ignited by compression rather thank spark plugs. This means it's torque-ier, has better volumetric fuel efficiency, the engine tends to be more rugged and the fact that diesel fuel is actually an oily substance it has self-lubricating properties.

Diesels are better for anything requiring high torque, low RPM but they're also more reliable and can be made more fuel efficient if done right. Many if not most cars in Europe are turbocharged diesels nowadays because that's the optimum solution for sufficient power, torque, fuel efficiency, manufacture and maintenance costs.



this. surprisingly insightful post, featuring accurate terminology, concise knowledgeable conclusion.

Best post in years. Thanks anon



>You mean the Germans in VW. "The EU" isn't a country, though the bureaucrats in Brussels sure seem to want it to be.

And French cars like Peugeot and Citroen. They pushed the diesel thing more than the German companies even.

The point is, the car companies convinced the EU that diesel was cleaner than petrol. So it was enforced through EU regulations and they got to sell a lot of cars because people believed they were being clean.

Nobody outside the EU was stupid enough to believe that.


>Diesel is more energy dense and less volatile

Petrol has a higher calorific content than diesel.




Can mean a lot of different things. The particular metric of "cleanness" the euros violated was Nitrogen Oxide emissions, which are not controlled as tightly in the EU. Nitrogen Oxides form when you burn lean mixtures at very high temperatures, which is what forced induction diesels do. There are many who think the American NOx regulations are what they are to favour American-made petrol cars over Euro import turbodiesels. I don't have any horse in this race myself, but you're just regurgitating things you haven't bothered to research fully.

>gasoline has higher calorific content

Yes, but you don't pay for fuel by the pound/kilogram, you pay for it by the gallon/liter. And your fuel tank is volume-limited. So what we care is volumetric energy density - units of energy per unit of volume. Calorific content is units of energy per unit of mass. Gasoline is substantially less dense than diesel and therefore has lower volumetric energy density (36mj/l for diesel vs 32mj/l for gas).



>Clean Can mean a lot of different things

I mean clean in terms of doing less harm to peoples health.

According to government statistics 640 premature deaths per year in my country are linked to car engine emissions. If diesel emissions were on par with those released by petrol cars, the figure drops to 110.



Sure, but my point is that diesels are used for a reason. It's not some sort of EU scam pushing a dirty engine as a clean alternative, and people don't buy them because they are "clean". Fuel is generally quite a lot more expensive in Europe than it is in the US so diesels are much more competitive in our market. Purchasing a car is always a balancing act between many variables such as up front cost, performance, comfort, fuel expenses, maintenance expenses, etc. Diesels are generally somewhat more expensive up front but this is offset by the savings on fuel in many places. Diesel engines are also simply more efficient than petrol engines due to their design, and thus produce less overall emissions, though there is a higher percentage of more nasty shit like the aforementioned NOx in said emissions.

It's a complex topic, but you seem hell bent on framing it as some sort of boomer patriotism USA vs EU issue.



>you seem hell bent on framing it as some sort of boomer patriotism USA vs EU issue.

Its more of a EU vs the rest of the world issue. They slashed the tax on diesel within the EU and kept increasing the taxes on petrol. Using environmentalism as the rational behind it. Thats why we took it up while the entire rest of the world didnt.

I remember my mechanic friend 30 years ago saying that Diesel was not cleaner than petrol and this whole thing would end badly.

Now we are getting put to shame in air quality not just by the USA but by the whole world.


File: eebfd29f8b25b13⋯.png (1.75 MB, 750x1334, 375:667, disgust.png)


What in the goddamn even is this spacing, nigger?



>Now we are getting put to shame in air quality not just by the USA but by the whole world.

Yeah I'm pretty sure fucking China puts our air quality to shame.



I'm a noob when it comes to cars but diesel seems like it's so much better than gasoline, even in normal consumer cars. There's hardly any price difference in $/mile and the vehicles have only slightly higher msrp. Supposedly the diesel engines are cheaper to maintain and last longer too. Why don't people use diesel more, is it just inertia?



There are a few downsides like diesel fuel gels in cold weather while gasoline stays liquid and DPF filters get clogged if you only drive short trips.



If you drive in the city then its cheaper per mile to have a petrol. If you do a lot of interstate driving then diesel is cheaper.

Petrol engines are actually easier to maintain due to their simplicity. And due to the car being lighter it suffers much less general wear and tear on things like the tires and running gear.

The engine has much higher rotating inertia. Which is a huge contributor to efficiency when you are starting and stopping all the time. Obviously a lighter car is more nimble and handles better, if you care about that.

If you are mostly driving on the highway at a constant speed away from large populations of people then diesel is certainly worth considering.



What about colourblind people



They are the work of the devil.



How to learn more car autism? I dont understand the logic chains you've made. Why does no sparkplugs mean more torque for example



What does on par even mean? What do the spacings mean?


I heard you can run vegetable oil in a diesel engine? Is this true? How does thst work? And what happens if you mix fuels and can it be undone?



>I remember my mechanic friend 30 years ago saying that Diesel was not cleaner than petrol and this whole thing would end badly.

Well, that's obviously a complicated topic, but if you use biodiesel, isn't it infinitely better than gasoline, being carbon-neutral?


>diesel fuel gels in cold weather while gasoline stays liquid

Don't modern cars have battery-powered heaters?


What about this argument that because compression ratios are higher in diesel, the materials must be sturdier to withstand it, therefore it ends up being more durable overall?


It is true. I'm a noob but it seems like basically the diesel compresses the air in the cylinder a lot as part of its stroke. This increases temperature enough for oil to ignite. Because it's a purely temperature based effect (rather than a spark) even relatively dirty fuel oils will work. In fact, the diesel oil you buy at the gas station is just an artificial uber oil made by mixing petroleum components.

Dirty oils however have slightly worse mileage (10-20% so not really a big deal) and clog up the filter more. Otherwise yes you can put pretty much any oil in there, even leftover fry grease from McDs. It's the same thing as the "intended" diesel fuel, just slightly lower quality. If you mix shit oil with good diesel you just get medium quality fuel that's half as bad as the oil.


The lights are all green for gas in us burbs (seen some mobils and GPs in my visit). But in leafland all the prices are red, gas and diesel. Guess it different depending on the location


So diesel is more expensive than gas in the us? Where I live diesel is the cheapest.

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