Anybody else notice this at the gas stations???

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You're joking right? On average cars have 60L tanks, half a tank is 30L or 60lbs

You're telling me 60lbs is going to alter your fuel mileage significantly higher than you will notice it from day to day? I call BS.

Unless you're hypermilling, drafting trucks, pulse and coasting, Engine off coasting, aero modding, emptied EVERYTHING unnecessary out of your car THEN AND ONLY THEN, would you be looking at extra 60lbs of fuel more closely. And even then, washing your car and waxing it will give you a better MPG increase than what 60lbs of "extra" fuel you've removed will help. Lets not even talk about the added idle time and wasting pulling into and out of gas stations.

There are some crazy hypermillers, who go so far as to say that backing the car up while warm is better than reversing out while engine is warming up as it wastes less fuel. Congratulations, you just topped those nuts.

Aslan said:
I'm surprised nobody has mentioned this yet...

Don't fill the tank from half. Never fill it unless range is an issue. You are only wasting more fuel lugging around that extra half talk, not to mention brakes. That said, I often fill anyway so I can get a roughly accurate mileage number, I suppose I could calculate with a 10l top-up between two low-fuel lights but I don't know how accurate that is, nor do I care.
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His name is Aslan.

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RockerGuy said:
You mentioned its the same regardless of temperature. Which is false, doesn't matter if its indoor or outdoor.

When a pump states "corrected to 25*C" it simply means that the pump should measure 1L at 25*C, not at other temps. There's something called Standard Temperature & Pressure, that's an internationally accepted standard to take measurements.

Another thing is you'll get less gas at higher altitudes ie mass not volume. Volume will remain the same. Its due to something called vapour pressure


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I stand corrected. I for some reason believed that the temp of fuel was regulated prior to arriving at nozzle.
 
Red_Liner740 said:
When did you turn all smart??
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I don't want to be a know it all, but since some people were mis-informed I just wanted to shed some light. But I'll keep my mouth shut next time.

Sent from my tablet using my paws
 
Aslan said:
I'm surprised nobody has mentioned this yet...

Don't fill the tank from half. Never fill it unless range is an issue. You are only wasting more fuel lugging around that extra half talk, not to mention brakes. That said, I often fill anyway so I can get a roughly accurate mileage number, I suppose I could calculate with a 10l top-up between two low-fuel lights but I don't know how accurate that is, nor do I care.
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In cooler weather I consider the half full mark, as my empty mark. Less air you have in the tank, less water you will have as well.
 
oilycreek said:
I'm not sure if temperature compensation for gasoline is the same as natural gas, but I manually set our temperature compensation on our NGV stations,. The colder it gets, the less fill the vehicle's get. The reason for it is, if a vehicle is filled at a cold temperature, then is parked inside where the temperature could be 15 degrees warmer, the pressure will increase in the cylinder and risk blowing the relief, filling the place with natural gas. Also if it's filled in the morning, and the temperature increases during the day, the pressure in the cylinder will increase.
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How often does the compensation get changed?

I thought the gasoline temperature compensation didn't change much as the fuel in the underground tank maintains a relatively constant temperature all year. I thought the compensation was to correct from the ground temperature (something like 5 or 10 degrees C) to 15 degrees C (ie. pumping less fuel to allow for expansion). Maybe my thought process is entirely wrong though.
 
We set ours every month during the winter,we float them during the summer months. It's dependent on the ambient temperature. The colder the ambient the lower we set it. ie. If it's +5 we will set it to 2800 psi, but if it's -10 we will set it at 2400, I believe gasoline is the same type of thing. If you fill up in the morning and it's cold, then warms up during the day it's expands.
 
Let me also add that there was not a big change in weather when I was recording these readings.
I was doing this between Sept and Oct where the temperature didn’t vary that much and didn’t go below freezing.

I said half tank, but really I was measuring when I got to 200-220 kilometres. Normally it would take 18-20 litres to fill it back to full tank.
On the Saturdays it would take 24-26 litres to fill instead of the normal 18-20 litres on the weekdays. When there is a 4-6 litres difference to fill up, wouldn’t you raise your eyebrows?

I do have a 20 litre gas canister which I will start using.


awdmig said:
Wow all these posts and maybe a handful are useful?

OP: You need to do an average to see if the pump you are going to is ripping you off. If you are keeping track of your mileage properly and not just going by "half tank" this should be easy. When you fill on Saturday whats your trip vs say other days? Have you driven in the city a lot more, idled etc? If so this will affect your mileage.

If you complain it wont be taken seriously if you dont have proper numbers.
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BLUE_KAWI said:
Let me also add that there was not a big change in weather when I was recording these readings.
I was doing this between Sept and Oct where the temperature didn’t vary that much and didn’t go below freezing.

I said half tank, but really I was measuring when I got to 200-220 kilometres. Normally it would take 18-20 litres to fill it back to full tank.
On the Saturdays it would take 24-26 litres to fill instead of the normal 18-20 litres on the weekdays. When there is a 4-6 litres difference to fill up, wouldn’t you raise your eyebrows?

I do have a 20 litre gas canister which I will start using.
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The first thing that would occur to me to ask, is if you do 4-6L worth of driving on Friday night?
 
If ever there was a truly unbiased and purely objective scientific investigation, it is this! Science!!!!
 
Red_Liner740 said:
You're joking right? On average cars have 60L tanks, half a tank is 30L or 60lbs

You're telling me 60lbs is going to alter your fuel mileage significantly higher than you will notice it from day to day? I call BS.

Unless you're hypermilling, drafting trucks, pulse and coasting, Engine off coasting, aero modding, emptied EVERYTHING unnecessary out of your car THEN AND ONLY THEN, would you be looking at extra 60lbs of fuel more closely. And even then, washing your car and waxing it will give you a better MPG increase than what 60lbs of "extra" fuel you've removed will help. Lets not even talk about the added idle time and wasting pulling into and out of gas stations.
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I'm only mostly joking. Hypermillers are funny. They will go on and on about their range on a single tank instead of focusing on the important things.

I'm not saying it's significant but someone who's standard practice is to fill up from half is either fueling too often (Your extra idle and pulling in and out of gas stations) or has their eyes on the wrong prize. Unless there is something to this water thing [Citation needed.]

In real life, I only care enough to remove 50lbs of tools or change fueling practices if it's convenient. On the other hand, I do coast with the clutch in all the time, why the heck would I race to an avoidable stop?

Red_Liner740 said:
There are some crazy hypermillers, who go so far as to say that backing the car up while warm is better than reversing out while engine is warming up as it wastes less fuel. Congratulations, you just topped those nuts.
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Parody Success.
 
Aslan said:
On the other hand, I do coast with the clutch in all the time, why the heck would I race to an avoidable stop?
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On some cars, coasting while in neutral or with the clutch in will use more gas than leaving the vehicle in gear with your foot off the gas. Some cars shut off the fuel when coasting in gear (VW TDI for one).
 
Rob MacLennan said:
They never stopped. They just stopped making it mandatory.
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Da fuq? No way. I'll be speaking to a brick wall when explaining things to these kids
 
RockerGuy said:
Da fuq? No way. I'll be speaking to a brick wall when explaining things to these kids
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Good luck.

I predict that in 50 years there will be a great shortage of people who understand F=m*a or know which way to turn a wrench.

Carl-Sagan-We-live-in-a-society-exquisitely-dependent-on-science-and-technology-in-which-hardly-anyone-knows-anything-about-science-and-technology.jpg
 
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