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


Closed Thread
 
Thread Tools Search this Thread
Old 1st June 2010, 16:18   #1
BHPian
 
sidd25's Avatar
 
Join Date: Oct 2009
Location: Pune
Posts: 136
Thanked: 7 Times
Default Perfect way to measure Fuel efficiency

Guys,

I am in a lookout for different ways to measure fuel efficiency.
Please let me know how can I get the most correct Fuel efficiency measured.

Thanks.
sidd25 is offline  
Old 1st June 2010, 16:21   #2
Senior - BHPian
 
Spitfire's Avatar
 
Join Date: Jul 2006
Location: Panaji - Goa/Bangalore - Karnataka
Posts: 3,242
Thanked: 692 Times
Infractions: 0/1 (7)
Default

Under what conditions? Altitude? load? type of engine? vehicle? ambient temperature?

You have access to an engine test bed? That would be your best bet.
Spitfire is offline  
Old 1st June 2010, 16:23   #3
BHPian
 
sidd25's Avatar
 
Join Date: Oct 2009
Location: Pune
Posts: 136
Thanked: 7 Times
Default

Quote:
Originally Posted by Spitfire View Post
Under what conditions? Altitude? load? type of engine? vehicle? ambient temperature?

You have access to an engine test bed? That would be your best bet.
Thats too technical for me. I own a i10 era.
sidd25 is offline  
Old 1st June 2010, 16:45   #4
Senior - BHPian
 
addyhemmige's Avatar
 
Join Date: Dec 2008
Location: Bangalore/Hassan
Posts: 1,549
Thanked: 465 Times
Default

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
addyhemmige is offline  
Old 1st June 2010, 16:55   #5
Senior - BHPian
 
Join Date: Mar 2007
Location: Mumbai
Posts: 1,457
Thanked: 282 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.
One thing here is to make sure that, at both times, the petrol pump chap doesn't fill the fuel beyond when it automatically stops.
carboy is offline  
Old 1st June 2010, 17:02   #6
BHPian
 
Mr.Bangalore's Avatar
 
Join Date: Jul 2006
Location: Bengalooru
Posts: 359
Thanked: 43 Times
Default

Quote:
Originally Posted by addyhemmige View Post
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
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.
Mr.Bangalore is offline  
Old 1st June 2010, 17:02   #7
BHPian
 
Ardy's Avatar
 
Join Date: Jan 2009
Location: Hyderabad
Posts: 613
Thanked: 86 Times
Default

This is what I read at one of the MASS regarding the best way of measuring FE:

1. Fill tankful fuel.
2. On empty, fill fuel from the same pump and preferably from the same nozzle.

Then apply the formula that addyhemmige is suggesting.

This approach of refilling up from the same pump and from the same nozzle will take care of the measurement variances between various pumps and nozzles.

Cheers,
Ardy is offline  
Old 1st June 2010, 17:20   #8
Team-BHP Support
 
mobike008's Avatar
 
Join Date: Sep 2006
Location: Hyderabad
Posts: 10,749
Thanked: 7,964 Times
Default

For me, its always been like below which is like bible for me to check on my FE :

Fuel Tank Capacity : 45 Litres
Low fuel warning lamp comes up at 37 Litres of completion.

I tank up immediately ( it always comes to 37 Litres with auto-cut off) and set the trip meter to 0.

When i get the low fuel warning lamp. I do this :-

No. of Kms Driven/37 Litres = My Perfect FE
mobike008 is offline  
Old 1st June 2010, 17:26   #9
BHPian
 
sidd25's Avatar
 
Join Date: Oct 2009
Location: Pune
Posts: 136
Thanked: 7 Times
Default

As per your suggestions. My car does not have a trip meter. So what do I need to do?
sidd25 is offline  
Old 1st June 2010, 17:30   #10
Senior - BHPian
 
ASHISHPALLOD's Avatar
 
Join Date: Oct 2006
Location: MH42
Posts: 1,987
Thanked: 285 Times
Default

Quote:
Originally Posted by mobike008 View Post
Low fuel warning lamp comes up at 37 Litres of completion.
Nice way to calculate FE.

For Maruti suzuki vehicles, there is no low fuel warning lamp because....
......''ye maruti suzuki hai, petrol khatam hi nahi hota''.....

Quote:
Quote:
@SIDD25:My car does not have a trip meter. So what do I need to do?
What? as per your profile, your car is i10 era.

Maruti don't provide low fuel warning lamp, hyundai don't provide trip meter. [ as per sidd25 and ye baat hazam nahi hoti ].

Last edited by ASHISHPALLOD : 1st June 2010 at 17:47.
ASHISHPALLOD is offline  
Old 1st June 2010, 17:35   #11
Senior - BHPian
 
addyhemmige's Avatar
 
Join Date: Dec 2008
Location: Bangalore/Hassan
Posts: 1,549
Thanked: 465 Times
Default

Your car doesn't have a trip meter? I thought all cars nowadays have tripmeters.

If you don't have a tripmeter, take a reading of the kms run on your odo meter when you fill up and take the reading again when you fill up the second time. The difference between the 2 readings should give you the kms run
addyhemmige is offline  
Old 1st June 2010, 22:20   #12
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

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

Last edited by Shan2nu : 1st June 2010 at 22:22.
Shan2nu is offline  
Old 2nd June 2010, 00:14   #13
Senior - BHPian
 
Gansan's Avatar
 
Join Date: May 2009
Location: Chennai
Posts: 3,428
Thanked: 878 Times
Default

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!

EDIT: I do this because I do not use the car daily. If you do, you can easily use the same method to calculate city mileage by filling twice within a gap of 4 - 5 days. BTW does the i10 really come without a trip meter?
Gansan is offline  
Old 2nd June 2010, 00:50   #14
MX6
Senior - BHPian
 
MX6's Avatar
 
Join Date: Oct 2009
Location: City of seven islands.
Posts: 2,882
Thanked: 210 Times
Default

which 'era' is your i10 from?
Surprised that it doesn't have a trip meter.
Anyway, in case there really is no trip meter, then when you tank up see the reading in the odo. Then go back to the same pump / same nozzle when your tank is almost empty and tank up again. Get the reading in odo again.
Diff in odo readings / fuel that went in second time gives you your mileage.
Don't tell me that your i10 era doesn't have an odo as well

And as far as I know, an i10 era comes with a digital odo (the electronic stuff). It is supposed to have two trip meters as well (I guess), so play around with the dash controls, you might get to see the trip meter readings pop up in the digital odo itself.

Last edited by MX6 : 2nd June 2010 at 01:00.
MX6 is offline  
Old 2nd June 2010, 01:21   #15
BHPian
 
deep_bang's Avatar
 
Join Date: Mar 2007
Location: Bangalore / Boise
Posts: 595
Thanked: 291 Times
Default

I10 not having a trip meter? I am surprised.
Alto has a trip meter - i am almost ready to bet i10 has it. Some cars have only a single line display and don't show the trip meter unless you press that small black button near the ODO. Long press of this button clears the trip meter.
deep_bang is online now  
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 11:25.

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