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Fuel tank logic
Rank: Elder Joined: 9/23/2009 Posts: 8,083 Location: Enk are Nyirobi
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CLK wrote:McReggae wrote:There can be so many factors:
1. Shape of the tank, have seen it, it might be smaller at the bottom yet the gauge is linear.
2. The fuel pump only sucks in liquid and not vapour so as explained up there, room for evaporation is more when the tank is empty.
3. Some gauges are designed to show that FULL is FULL but EMPTY is never EMPTY....this helps you not to run out of fuel.
4. Your fuel gauge is not necessarily an accurate precision instrument!!!!! Highly doubt the shape of the tank would matter since am looking at the number of kilometers the car says the fuel should take me not the pin position. Full tank=700km, when i measure the number of kilometers at half tank, its abt 350-400km and the cars says so, however even when the car says i have 350km worth of fuel it will only take me for 200km. So i used to fuel 3 times in a month full tank always, so whoen i realized this, i started refilling the tank at every half tank, which was equal to 4 refills of half a tank each, saving a full tank worth of fuel in the process. This is what did not make sense. And maybe what harrydre said would explain it.. Most cars will do an extra 100km after the tank runs "empty". meaning you can still squeeze out an extra 100km on the "reserve tank" or thereabouts from your 2nd half before refueling. Life is short. Live passionately.
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Rank: Veteran Joined: 9/21/2011 Posts: 2,032
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@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk…
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Rank: Member Joined: 4/1/2009 Posts: 846
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limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month.
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Rank: Elder Joined: 3/2/2009 Posts: 26,331 Location: Masada
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CLK wrote:limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month. Interesting find, I will try this. Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.
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Rank: Elder Joined: 9/23/2009 Posts: 8,083 Location: Enk are Nyirobi
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CLK wrote:limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month. @CLK at this point , i dare say that you are suffering from "confirmation bias": en.m.wikipedia.org/wiki/Confirmation_bias Why don't you refuell at the 3/4 mark then and save another tank per month! or are you saying there is some magic at the half tank mark? Life is short. Live passionately.
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Rank: Member Joined: 4/1/2009 Posts: 846
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sparkly wrote:CLK wrote:limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month. @CLK at this point , i dare say that you are suffering from "confirmation bias": en.m.wikipedia.org/wiki/Confirmation_bias Why don't you refuell at the 3/4 mark then and save another tank per month! or are you saying there is some magic at the half tank mark? sijui nikwambie nini, i only wanted a logical explanation to my findings/conclusions, which a few guys questioned hence the detailed revelations on how i came up with the conclusions, you are entitled to your opinion though. I was hoping someone else had experienced something similar..
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Rank: Elder Joined: 9/23/2009 Posts: 8,083 Location: Enk are Nyirobi
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CLK wrote:sparkly wrote:CLK wrote:limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month. @CLK at this point , i dare say that you are suffering from "confirmation bias": en.m.wikipedia.org/wiki/Confirmation_bias Why don't you refuell at the 3/4 mark then and save another tank per month! or are you saying there is some magic at the half tank mark? sijui nikwambie nini, i only wanted a logical explanation to my findings/conclusions, which a few guys questioned hence the detailed revelations on how i came up with the conclusions, you are entitled to your opinion though. I was hoping someone else had experienced something similar.. Just suggesting that you take the experiment one step further and confirm your findings. Ask for me, i find that regularly servicing the car gives me excellent fuel economy. Life is short. Live passionately.
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Rank: Elder Joined: 3/2/2009 Posts: 26,331 Location: Masada
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sparkly wrote:CLK wrote:sparkly wrote:CLK wrote:limanika wrote:@CLK, Interesting responses, do not just look at consumption…When filling the tank from empty to half, how much do you spend and compare this to how much you spend when filling from half to full? Answer that and also read https://autos.aol.com/article/gas-gauge/ then we talk… @Limanika, factored that in too, hence how i came with the conclusion that i actually spend more on fuel per month if i let refilled only when the light comes on compared to refilling at every half tank. Full tank cost in the range of 6500-7k and i will refill at half tank with 3200-3500 which makes sense, for instance i do half a tank every 6-7 days, so i can comfortably refill every Friday with half a tank making it two full tanks a month, however a full tank takes me 10 days or 11 at most, making it 3 full tanks a month. @CLK at this point , i dare say that you are suffering from "confirmation bias": en.m.wikipedia.org/wiki/Confirmation_bias Why don't you refuell at the 3/4 mark then and save another tank per month! or are you saying there is some magic at the half tank mark? sijui nikwambie nini, i only wanted a logical explanation to my findings/conclusions, which a few guys questioned hence the detailed revelations on how i came up with the conclusions, you are entitled to your opinion though. I was hoping someone else had experienced something similar.. Just suggesting that you take the experiment one step further and confirm your findings. Ask for me, i find that regularly servicing the car gives me excellent fuel economy. I want to try this but scientifically it all boils down to the fact that with full tank we have less evaporation; that's the only viable explanation...and topping at 3/4 instead of 1/2 tank may yield poorer result due to carry dead weight in form of fuel...the at half tank refill may be the inflexion point in all these!!!  Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.
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Rank: Veteran Joined: 9/21/2011 Posts: 2,032
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@Impunity, there is no notable vaporisation in my opinion. Please take note:
• Fuel tanks are located on the sheltered underside of the cars, so no much temperature rise within or in vicinity of the tank. Gasoline evaporates at 350C at atmospheric pressure.
• The fuel tank has air tight lid, so no vapour leaks out of the tank.
• The air in fuel tank is always saturated with gasoline vapour, so there is negligible vaporisation.
If you left your car with half full tank for considerable period of time, how long would it take for all the fuel to vaporise and disappear?
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Rank: Veteran Joined: 7/22/2008 Posts: 1,139
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while at it. when do the car consume more fuel while stopping at traffic lights. when on Neutral or Drive. "You're not supposed to be so blind with patriotism that you can't face reality. Wrong is wrong, no matter who says it". Malcolm X
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