Go Back   Team-BHP > Under the Hood > Technical Stuff


Closed Thread
 
Thread Tools Search this Thread
Old 2nd June 2010, 01:46   #16
BHPian
 
Ranjimso's Avatar
 
Join Date: Aug 2009
Location: Bangalore
Posts: 116
Thanked: 19 Times
Default

Quote:
Originally Posted by Gansan View Post
This is how I calculate mileage after the car comes back from service:

Select a Sunday morning. Fill petrol at my favourite pump. After auto cut off, continue to fill manually up to an inch below the lid of the fuel tank. Wait for a few seconds to see if the tank burps. If it does, fill a little more. Note down the quantity, set the trip meter to zero and take the car on a leisurely highway drive for ~ 50 KM round, non-stop trip. Return to the same bunk, same nozzle and fill petrol again as described above. Calculate the FE for the distance covered / fuel consumed.

This gives the "best" mileage possible under the most favourable conditions. Safely knock off 6 - 7 KM from this figure to arrive at the city mileage. Then forget the whole thing for the next 6 months!
This actually works better - gives you an almost precise FE figure

Last edited by Ranjimso : 2nd June 2010 at 01:53.
Ranjimso is offline  
Old 2nd June 2010, 03:02   #17
Senior - BHPian
 
harry10's Avatar
 
Join Date: Jul 2008
Location: Faridabad/Delhi
Posts: 2,226
Thanked: 578 Times
Default

Quote:
Originally Posted by addyhemmige View Post
I usually top the tank up and set the tripmeter to zero. When the tank is nearing empty, I fill it up again. So, If I divide the no of kms run by the no of liters filled (the second time), I should be able to get the average consumption.

Or you could get a car like a punto or a Linea which has a Multi Info display screen which shows average fuel consumption on a real time basis
And Manza too has it.
Surprisngly its quiet accurate as well.

Checked twice and both times its showing the exact figure as deducted by the tank full method itself
harry10 is offline  
Old 2nd June 2010, 11:34   #18
BHPian
 
Join Date: Sep 2009
Location: Bangalore
Posts: 31
Thanked: Once
Default

I own an i10 kappa magna and it does have a tripmeter.
anusha_snh is offline  
Old 2nd June 2010, 12:27   #19
Team-BHP Support
 
mobike008's Avatar
 
Join Date: Sep 2006
Location: Hyderabad
Posts: 10,749
Thanked: 7,964 Times
Default

Quote:
Originally Posted by anusha_snh View Post
I own an i10 kappa magna and it does have a tripmeter.
I too own an i10 Kappa Magna and it does have one too

In my kappa, i know the LFWL comes up at exactly 30 Litres and its tank capacity is 35L. Divide number of kms covered/30L = Perfect FE

@Sid, i think you need to check your manual again and get used to using the trip meter. Set it to 0 when you fill your tank and then when you refuel simply divide the kms driven.

A bit here and there, the FE will be known. Moreover, i do know that TBHPian's arent sticklers for perfect FE running into fractions for e.g :
12.538 kmpl
mobike008 is offline  
Old 2nd June 2010, 12:30   #20
Senior - BHPian
 
clevermax's Avatar
 
Join Date: Jun 2006
Location: Tvm/Amsterdam
Posts: 1,601
Thanked: 404 Times
Default

Quote:
Originally Posted by Mr.Bangalore View Post
i have serious doubt about this. B'coz i had taken the delivery of Punto 1.4 petrol for my sister from concord motors. But the average was showing 26 kmpl in trip A and trip B was showing avgerage of 18.9 kmpl.
The avg. FE can vary between two trip meters as it depends on when you reset it.

Suppose you reset the trip meter A and have a nice cruise through an empty highway for about 100 Kms. then you reset trip meter B also, and start climbing a hill or enter jam packed city traffic. (remember, Trip meter A is not reset at this point) After a while through bad roads or traffic, Trip meter A's mileage will definitely show a significantly higher value than B because it is the average of the highway run too.

26Kmpl on a 1.4 Petrol is unbelievable though. Even Punto MJD can't give that easily.

I find my Punto's mileage display to be very accurate. Measured using Full tank to full tank method as well. The overall FE for the past couple of thousand kilometers stands at 17.7 Kmpl.

Last edited by clevermax : 2nd June 2010 at 12:36.
clevermax is offline  
Old 2nd June 2010, 12:47   #21
BHPian
 
thewhiteknight's Avatar
 
Join Date: Apr 2009
Location: Poona
Posts: 101
Thanked: 199 Times
Default

Quote:
Originally Posted by Shan2nu View Post
There is no perfect way to guage fuel economy (unless you do it in a lab under controlled conditions).

In the real world, a tank up test would be your best bet.

Shan2nu
I agree. All the factors (stuff which Spitfire brought up) considered and/or ignored, this is the the ideal way of checking one's FE. There is no way way to accurately check for variations in tyre pressure, Conditions or roads, weight carried and for what distance, exact engine conditions, adulteration of fuel unless you go really techno-high.

The only thing to ensure is that you fill the same amount of fuel everytime and i dont mean this in terms of pumps and nozzles, which i dont deny are good things to do, but on average if you use the same fuel pump, irrespective of nozzles and fill up to the first cut off and then measure the kms v/s fuel consumed, you should get a decent indicator of the FE.
thewhiteknight is offline  
Old 2nd June 2010, 13:08   #22
Senior - BHPian
 
McLaren Rulez's Avatar
 
Join Date: Dec 2007
Location: Mysore
Posts: 2,375
Thanked: 474 Times
Default

Why is this in Shifting Gears? This is a proper technical question. I suggest the mods move it.

As to checking fuel efficiency, tankful to tankful works but your driving style, traffic etc. may vary. Its best if you cover a large number of kilometers and average out the readings from the tankful to tankful method. That is, if you have the patience to do so.
McLaren Rulez is online now  
Old 2nd June 2010, 13:55   #23
BHPian
 
sidd25's Avatar
 
Join Date: Oct 2009
Location: Pune
Posts: 136
Thanked: 7 Times
Default

Name:  i10.JPG
Views: 1325
Size:  20.0 KB
Can some one explain which one is a trip meter in this.
This is of a different i10 model.
Era has a little different odometer.

Last edited by sidd25 : 2nd June 2010 at 14:02.
sidd25 is offline  
Old 2nd June 2010, 14:09   #24
BHPian
 
Mr.Bangalore's Avatar
 
Join Date: Jul 2006
Location: Bengalooru
Posts: 359
Thanked: 43 Times
Default

Quote:
Originally Posted by clevermax View Post
The avg. FE can vary between two trip meters as it depends on when you reset it.

Suppose you reset the trip meter A and have a nice cruise through an empty highway for about 100 Kms. then you reset trip meter B also, and start climbing a hill or enter jam packed city traffic. (remember, Trip meter A is not reset at this point) After a while through bad roads or traffic, Trip meter A's mileage will definitely show a significantly higher value than B because it is the average of the highway run too.

26Kmpl on a 1.4 Petrol is unbelievable though. Even Punto MJD can't give that easily.

I find my Punto's mileage display to be very accurate. Measured using Full tank to full tank method as well. The overall FE for the past couple of thousand kilometers stands at 17.7 Kmpl.
@Clevermax i agree to your points, but it was before delivery, and when i asked the Sales person, the answer i got was (sir, it was driven b/w 10-20 kms inside the city, so the average is so much) and i said to myself no point discussing such things with these auto sales guys who does'nt know the basics of the automobiles and treat the customers like a laymen who will believe whatever they say.

Also will update the latest FE shortly since my sister is not using the car that much

Quote:
Originally Posted by sidd25 View Post
Attachment 360284
Can some one explain which one is a trip meter in this.
This is of a different i10 model.
Era has a little different odometer.

hello Sidd25,

you can see a stick pointing out from the temp gauge. Just press once it will be your Trip A and press again it will be Trip B.
If you press it for long it will reset to zero.

Last edited by bblost : 2nd June 2010 at 14:22. Reason: back 2 back post. Please use edit post if posting within 20 mins. Thanks.
Mr.Bangalore is offline  
Old 2nd June 2010, 15:05   #25
Senior - BHPian
 
clevermax's Avatar
 
Join Date: Jun 2006
Location: Tvm/Amsterdam
Posts: 1,601
Thanked: 404 Times
Default

Quote:
Originally Posted by Mr.Bangalore View Post
and i said to myself no point discussing such things with these auto sales guys who does'nt know the basics of the automobiles and treat the customers like a laymen who will believe whatever they say.
.
Yes, no point in asking such things to them. I am yet to see a sales guy who treats customers according to their type - enthusiasts should get treated in different way than businessmen looking for a car, and so on. And yes, almost all of them think that they can just bulls*t and customers would believe all they say.

Quote:
Originally Posted by sidd25 View Post
Attachment 360284
Can some one explain which one is a trip meter in this.
This is of a different i10 model.
Era has a little different odometer.
If I don't know, I'd be checking the manual to find that out. Your electronic display should show the trip distance when you trigger that mode, probably by pressing some button near the meter or on dash somewhere.

Last edited by clevermax : 2nd June 2010 at 15:09.
clevermax is offline  
Old 2nd June 2010, 15:25   #26
Senior - BHPian
 
pramodkumar's Avatar
 
Join Date: Mar 2006
Location: Gods own country
Posts: 1,993
Thanked: 857 Times
Infractions: 0/1 (5)
Default

The perfect way to measure FE, is full tank to full tank from the same pump atleast 5 times and then take an average of the FE.

Pramod
pramodkumar is online now  
Old 2nd June 2010, 15:27   #27
BHPian
 
Join Date: Apr 2009
Location: London
Posts: 425
Thanked: 484 Times
Default

Was seeing a Top Gear show recently and Jeremy Clarkson was testing an Audi with his usual antics. The test was to see how far will an Audi go on a full tank and challenge was to reach London from outside London.

After driving for long, the meters showed that the fuel tank is empty and needs refueling asap.

Even after that Jeremy drove for 52 miles and reached a gas station.

Are these indicator accurate or is it designed to make drivers think the tank is empty when there is actually some fuel left in the tank.?

Regards
chandrda is offline  
Old 2nd June 2010, 15:33   #28
Senior - BHPian
 
clevermax's Avatar
 
Join Date: Jun 2006
Location: Tvm/Amsterdam
Posts: 1,601
Thanked: 404 Times
Default

Quote:
Originally Posted by chandrda View Post
After driving for long, the meters showed that the fuel tank is empty and needs refueling asap.
Even after that Jeremy drove for 52 miles and reached a gas station.

Are these indicator accurate or is it designed to make drivers think the tank is empty when there is actually some fuel left in the tank.?

Regards
depends from car to car. In my Petrol car, the amber light turns on when there's about 5 liters fuel left. Sometimes it turns on even later - once my father ran out of fuel while driving with an amber light, hoping that there's at least 2 litres.

New cars which shows the DTE (Distance to Empty) will not count down all the way to Zero. They count down till 50 or so, and then issue a warning. This means one should re-fuel immediately as there's fuel left only to drive about 50 Kms. So in Jeremy's case, its not a big surprise that he could drive 50+ miles after the warning came. It doesn't make sense to issue this warning at the very last drop of fuel right?

Last edited by clevermax : 2nd June 2010 at 15:35.
clevermax is offline  
Old 2nd June 2010, 16:43   #29
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,381
Thanked: 22,610 Times
Default

Quote:
Originally Posted by sidd25 View Post
Can some one explain which one is a trip meter in this.
This is of a different i10 model.
Era has a little different odometer.
Sid25,

Simply put, an odometer shows how many kms your car has run in total.

A trip-meter is the same thing, but it can be reset so that it starts from 000000 whenever you want it to. Eg. At the begining of a trip.


As for measuring Fuel Efficiency, please see these existing threads (and remember to use SEARCH in the future) :

Measuring FE - Clinical Method vs Practical Method (FE Measurement - Clinical method and Practical Method)

How do you calculate mileage? (How do you calculate mileage for your car)

Whats your actual Fuel Efficiency? (What is your Actual Fuel Efficiency?)

Thanks to condor for providing the links.

Please continue in one of the above threads as this thread is now closed.
R

Last edited by Rehaan : 2nd June 2010 at 16:44.
Rehaan is offline  
Closed Thread


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel efficiency norm for cars ready. EDIT : Coming our way in 2011 dadu The Indian Car Scene 44 16th May 2015 15:13
Anti-Theft Measure : Etching registration number on the windows F50 Street Experiences 62 1st February 2014 13:49
Fuel indicator in spark whether a correct measure of amount of fuel bkm Technical Stuff 2 3rd April 2008 14:24
Measure of Road Rage - A New Project herculesksp Shifting gears 1 11th July 2007 14:59
how do i measure the real HP of my bike ? ac 427 Technical Stuff 15 13th June 2007 14:51


All times are GMT +5.5. The time now is 11:43.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks