How to judge fuel consumption

Payton

What is the best way on how to judge fuel consumption? (eg. Kms per liter)

Anan1

Do you mean the best way to calculate it, or the best way to decide whether it's good?

Payton

The best way to calculate it, What we have being doing is filling the tank to the brim and take note how many liters it took, then reset the Trip and has soon has the fuel indicator starts flashing take note of the distance. Is that correct?

flyingsnail

edit misread

Idleater

on the verge wrote: »

The best way to calculate it, What we have being doing is filling the tank to the brim and take note how many liters it took, then reset the Trip and has soon has the fuel indicator starts flashing take note of the distance. Is that correct?

Ish,
You can measure fill to fill easier than full to empty. I use the "b" trip to count the distance since I last filled. Then assuming I fill it to the same point eg the cut off click, then I have the exactish amount of fuel used for that "trip". Reset the b trip and start over.
After a while you get used to the distance per tank.

dev100

Ah there is a similar thread going on else where. Most simple method is to fill car up to the brim . Take note of what you paid per litre and the amount of litres of fuel you purchased. Reset odometer to 0. Then as you would normally drive. Refill when fuel light comes on. Refill up to brim. Check mileage or kms on car. That will give you the best fuel consumption indicator. Really you will need to do this several times to get an average.

Or if you to lazy to do all that. Fill car to brim reset odometer to 0. Drive 100 km and refill in garage and the quantity you refill is your average.

Anan1

on the verge wrote: »

The best way to calculate it, What we have being doing is filling the tank to the brim and take note how many liters it took, then reset the Trip and has soon has the fuel indicator starts flashing take note of the distance. Is that correct?

dev100's first way is best, so.

jsd1004

dev100 wrote: »

Ah there is a similar thread going on else where. Most simple method is to fill car up to the brim . Take note of what you paid per litre and the amount of litres of fuel you purchased. Reset odometer to 0. Then as you would normally drive. Refill when fuel light comes on. Refill up to brim. Check mileage or kms on car. That will give you the best fuel consumption indicator. Really you will need to do this several times to get an average.


Or if you to lazy to do all that. Fill car to brim reset odometer to 0. Drive 100 km and refill in garage and the quantity you refill is your average.

Your fuel consumption is how much you use. Dependent on driving style, journey type, duration, loading on car, prevailing wind..very arbitrary

dev100

jsd1004 wrote: »

Your fuel consumption is how much you use. Dependent on driving style, journey type, duration, loading on car, prevailing wind..very arbitrary

Yep your dead right. I assume the Op just wants an average indicator.

CiniO

dev100 wrote: »

Ah there is a similar thread going on else where. Most simple method is to fill car up to the brim . Take note of what you paid per litre and the amount of litres of fuel you purchased. Reset odometer to 0. Then as you would normally drive. Refill when fuel light comes on. Refill up to brim. Check mileage or kms on car. That will give you the best fuel consumption indicator. Really you will need to do this several times to get an average.

Sorry for correcting you, but it's actually opposite.
You fill up to the top, reset odometer, drive some distance - the more the better, and then fill up again and note number of litres that you put on.

Your result will be:

x = c / (d/100)

where:

c - number of litres filled
d - distance traveled in kms
x - fuel consumption in litres/100km.


Perfectly if you done it regulary over some period (f.e. a year).
Every time fill in to the top, note down number of litres filled. And note down distance.
In the end sum everything up, and use the same calculation.

Then the result will be very accurate.

F.E. for my car consumption counted with every fill varies between about 5.5 l/100km to 8 l/100km.
But average consumption over 3 years is 6.91 l/100km
That figure is counted over 3 years and over 60k kms, so it's very very accurate.

There are other methods too, such as reset your trip reading when the fuel light comes on, then you lash in the fuel and see how many miles you go before the light comes on again, apparently its as accurate as the brim method.

dev100

CiniO wrote: »

Sorry for correcting you, but it's actually opposite.
You fill up to the top, reset odometer, drive some distance - the more the better, and then fill up again and note number of litres that you put on.

Your result will be:

x = c / (d/100)

where:

c - number of litres filled
d - distance traveled in kms
x - fuel consumption in litres/100km.


Perfectly if you done it regulary over some period (f.e. a year).
Every time fill in to the top, note down number of litres filled. And note down distance.
In the end sum everything up, and use the same calculation.

Then the result will be very accurate.

F.E. for my car consumption counted with every fill varies between about 5.5 l/100km to 8 l/100km.
But average consumption over 3 years is 6.91 l/100km
That figure is counted over 3 years and over 60k kms, so it's very very accurate.

I think we are on the same page only you use a scientific mathamatical method of working out average. I just didnt have the brains to put your method onto the post:)
Any chance you being an accountant?:)

dev100

RoverJames wrote: »

There are other methods too, such as reset your trip reading when the fuel light comes on, then you lash in the fuel and see how many miles you go before the light comes on again, apparently its as accurate as the brim method.

We may find your buddy from last night to fight with you on this thread:)

CiniO

dev100 wrote: »

I think we are on the same page only you use a scientific mathamatical method of working out average. I just didnt have the brains to put your method onto the post:)

Sorry, I didn't mention exactly what I meant.
You said to fill up to the top, note down amount of fuel, drive and top up again and get the mileage. Count it.

Problem here was, that correct should be first after filling up drive, and then note down mileage and amount of fuel.

If you do it like you wrote, you will calculate amount of fuel used before filling up, with mileage done after filling up. So result will be compeltely random.

Any chance you being an accountant?:)

God no...
I'd die of boredom probably.

dev100

CiniO wrote: »

Sorry, I didn't mention exactly what I meant.
You said to fill up to the top, note down amount of fuel, drive and top up again and get the mileage. Count it.

Problem here was, that correct should be first after filling up drive, and then note down mileage and amount of fuel.

If you do it like you wrote, you will calculate amount of fuel used before filling up, with mileage done after filling up. So result will be compeltely random.



God no...
I'd die of boredom probably.

Your right .:) It was my stupidity I shouldnt have said that. There is no point in noting mileage before the fact. It just gives me a mental check because I continusely check fuel consumption every time I fill up.

Dardania

dev100 wrote: »

CiniO wrote: »

Sorry, I didn't mention exactly what I meant.
You said to fill up to the top, note down amount of fuel, drive and top up again and get the mileage. Count it.

Problem here was, that correct should be first after filling up drive, and then note down mileage and amount of fuel.

If you do it like you wrote, you will calculate amount of fuel used before filling up, with mileage done after filling up. So result will be compeltely random.



God no...
I'd die of boredom probably.

Your right .:) It was my stupidity I shouldnt have said that. There is no point in noting mileage before the fact. It just gives me a mental check because I continusely check fuel consumption every time I fill up.

Spritmonitor.de ftw

mandrake04

If you got an iPhone you can get an App like Fuel Log 3 it will work out a running total, of course you have to be disciplined and enter the details of each fill.