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Fuel tank logic
Rank: Veteran Joined: 9/21/2011 Posts: 2,032
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Impunity wrote:limanika wrote:Impunity wrote:limanika wrote:At neutral the engine has to burn certain amount of gas to keep running… it is not in gear thus has to struggle a lot more.
The RPM is direct indication of the gas you are burning – Doesn’t this shows how many times the engine is revolving per minute? The more the RPM, the more the energy used?
You are actually better of engaged in Drive as this way you reduce the wear and tear when moving the stick. If however stopping for more than one minute, you are better of shutting of the engine.
At Neutral the engine struggles to run as compared to while on load??? Only if I were a blonde nurse, but with my heavy technical background, NO please, thank you. @McReggae why is it normally advisable to leave it on drive? Any link please? My hand is always shifting that thinh to Neutral naturally when in stops! Which load? The car is motionless, even if you release the brake it will come to a stop very shortly – provided there is no car ahead of you So if you leave your car on drive and lift your feet off the brake pedal if moves then stops after a short while? Mine moves at 10km/h indefinitely not unless you drive an automatic gear bulldozer!  It will depend on gradient, if on level ground, car will move due to momentum until stopped by friction, if on downward slope it will race downwards, if on gentle upward slope it stops much sooner. But there is really no appreciable load on engine. As stated above, when under neutral, car has to keep all electronic systems active thus engine has to struggle somewhat. When gear is engaged, the work is simplified… Same case engine is more efficient at higher gear than lower gear when at high speed. Am no automotive expert though, this is for 2 cents..
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Rank: Elder Joined: 3/2/2009 Posts: 26,331 Location: Masada
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limanika wrote:Impunity wrote:limanika wrote:Impunity wrote:limanika wrote:At neutral the engine has to burn certain amount of gas to keep running… it is not in gear thus has to struggle a lot more.
The RPM is direct indication of the gas you are burning – Doesn’t this shows how many times the engine is revolving per minute? The more the RPM, the more the energy used?
You are actually better of engaged in Drive as this way you reduce the wear and tear when moving the stick. If however stopping for more than one minute, you are better of shutting of the engine.
At Neutral the engine struggles to run as compared to while on load??? Only if I were a blonde nurse, but with my heavy technical background, NO please, thank you. @McReggae why is it normally advisable to leave it on drive? Any link please? My hand is always shifting that thinh to Neutral naturally when in stops! Which load? The car is motionless, even if you release the brake it will come to a stop very shortly – provided there is no car ahead of you So if you leave your car on drive and lift your feet off the brake pedal if moves then stops after a short while? Mine moves at 10km/h indefinitely not unless you drive an automatic gear bulldozer! It will depend on gradient, if on level ground, car will move due to momentum until stopped by friction, if on downward slope it will race downwards, if on gentle upward slope it stops much sooner. But there is really no appreciable load on engine. As stated above, when under neutral, car has to keep all electronic systems active thus engine has to struggle somewhat. When gear is engaged, the work is simplified… Same case engine is more efficient at higher gear than lower gear when at high speed. Am no automotive expert though, this is for 2 cents.. What keeps all the electronic system active when gear is engaged so that work gets simplified for the car? My thinking the RPM is high at Neutral coz the engine runs freely without any obstruction hence the flywheel is able to keep the momentum thus assisting the engine...u consume less fuel while on idle as compared to while on Drive gear!!! Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.
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Rank: Elder Joined: 6/17/2008 Posts: 23,365 Location: Nairobi
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Impunity wrote:limanika wrote:At neutral the engine has to burn certain amount of gas to keep running… it is not in gear thus has to struggle a lot more.
The RPM is direct indication of the gas you are burning – Doesn’t this shows how many times the engine is revolving per minute? The more the RPM, the more the energy used?
You are actually better of engaged in Drive as this way you reduce the wear and tear when moving the stick. If however stopping for more than one minute, you are better of shutting of the engine.
At Neutral the engine struggles to run as compared to while on load??? Only if I were a blonde nurse, but with my heavy technical background, NO please, thank you. @McReggae why is it normally advisable to leave it on drive? Any link please? My hand is always shifting that thinh to Neutral naturally when in stops! So many links kwa goggle.....by the way a little more research has made me realize that you use more fuel on neutral on modern cars....hio tabia ilitokana na mambo ya carburettors. ..."Wewe ni mtu mdogo sana....na mwenye amekuandika pia ni mtu mdogo sana!".
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Rank: Veteran Joined: 9/21/2011 Posts: 2,032
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The neutral was not created to help you save gas when in jam or at traffic light. Main purpose is to relieve the transmission when shifting gears, and to enable you relieve the brakes if you have to stop for a considerable time when engine is still running. Engaging neutral when driving downhill is dangerous coz you lose ability to control the car… Let’s forget about saving fuel at neutral coz you don’t save any…and this wasn’t in the manufacturer’s mind at all anyway
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Rank: Veteran Joined: 9/21/2011 Posts: 2,032
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In other words, you can engage neutral for other reasons but not to save fuel.. If you live in California and want to save fuel, this is what you do: http://www.consumerenerg...ortation/consumer_tips/
If anyone has an authoritative link which shows you save fuel at neutral or when you re- fuelling at half full tank… please share…otherwise, Next thread!!!!
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Rank: Elder Joined: 6/8/2013 Posts: 2,517
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@CLK from my motoring experience I guess your ride is of Euluopean origin in particular Germany pedigree the type that UMK bought for ministers no? You have to forgive us for askin cause in area code + 254 we are generally conditioned to think Japanese and made to believe The Car Infront is. . . Now the instrument panels za Japs is nothin to write home about. I have only seen the feature in my Bhai friends VX . Any other Toyotas with this feature..? Reminds me of some old articles by J M Baraza @ Nation motoring pages Interesting insights on this thread and good comments from kina @ limanika appreciated . . . Keep sharing . CLK wrote:wilyum wrote:NA hii gadget,did it came with your car ama you installed locally? Its not a gadget, car displays how much fuel you have both on the fuel gauge and also in terms of kilometers, you press this button that changes the views to show other stuff like how many kilometers to a liter, for a given trip, it can show, how long in hrs and minutes, fuel consumption average, speed average etc ,besides the normal views on the speedometer. "😖😡KQ makes money for everyone except the shareholder 😏😏 " overheard in Wazua
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Rank: Member Joined: 3/18/2008 Posts: 377
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Interesting observations here! While in Neutral, the transmission is not linked to the engine. This means the engine is not under any load unless the AC is on; which means less fuel. The RPM keeps fluctuating to compensate differences in air/fuel ratio. The ideal air/fuel ratio is 13 to 1 but at times there are inconsistencies as a result of the temperature of air which affects combustion. All the same, when in gear (manual transmission)but with clutch pressed, its the same as being in neutral because the clutch disengages the engine from the gearbox which means the engine is on its on. Switching on the AC loads up the engine hence more fuel is used. For Automatic transmission, the fuel consumed under "N" and "D", varies slightly. In D, the torque converter is engaged which means slightly more load on the engine (but this is negligible). As mentioned earlier, the idling RPM fluctuates marginally to compensate air temperature differences otherwise the amount of fuel used/injected in the combustion chambers is determined by the instructions received from the throttle position sensors/mass airflow sensors which is determined by how far, aggressive and gentle the accelerator is pressed. "You've never lived until you've almost died; for those who have fought for it, life has a flavour the protected will never know."
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Rank: Member Joined: 4/1/2009 Posts: 846
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Siringi wrote:@CLK from my motoring experience I guess your ride is of Euluopean origin in particular Germany pedigree the type that UMK bought for ministers no?You have to forgive us for askin cause in area code + 254 we are generally conditioned to think Japanese and made to believe The Car Infront is. . . Now the instrument panels za Japs is nothin to write home about. I have only seen the feature in my Bhai friends VX . Any other Toyotas with this feature..? Reminds me of some old articles by J M Baraza @ Nation motoring pages Interesting insights on this thread and good comments from kina @ limanika appreciated . . . Keep sharing . CLK wrote:wilyum wrote:NA hii gadget,did it came with your car ama you installed locally? Its not a gadget, car displays how much fuel you have both on the fuel gauge and also in terms of kilometers, you press this button that changes the views to show other stuff like how many kilometers to a liter, for a given trip, it can show, how long in hrs and minutes, fuel consumption average, speed average etc ,besides the normal views on the speedometer. @Siringi, car is in this family yes. I like the bit where it shows your fuel consumption in real-time and at high speeds i see 88km/l for a couple of seconds, if only it could last longer. am not from the lakeside though 
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Rank: Veteran Joined: 4/1/2009 Posts: 1,885
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Siringi wrote:@CLK from my motoring experience I guess your ride is of Euluopean origin in particular Germany pedigree the type that UMK bought for ministers no? You have to forgive us for askin cause in area code + 254 we are generally conditioned to think Japanese and made to believe The Car Infront is. . . Now the instrument panels za Japs is nothin to write home about. I have only seen the feature in my Bhai friends VX . Any other Toyotas with this feature..? Reminds me of some old articles by J M Baraza @ Nation motoring pages Interesting insights on this thread and good comments from kina @ limanika appreciated . . . Keep sharing . CLK wrote:wilyum wrote:NA hii gadget,did it came with your car ama you installed locally? Its not a gadget, car displays how much fuel you have both on the fuel gauge and also in terms of kilometers, you press this button that changes the views to show other stuff like how many kilometers to a liter, for a given trip, it can show, how long in hrs and minutes, fuel consumption average, speed average etc ,besides the normal views on the speedometer. avensis. and many other toyota brands from uk.
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Rank: Member Joined: 6/5/2008 Posts: 23
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Even if the readout is digital. A fuel gauge is by its very nature inaccurate. Aviators dont even bother with them, preferring to use calculations to determine how much fuel they have on board.
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