How quickly measure fuel consumption?

How about return line? Not so easy, I am afraid.

Cheers
Serg

How can it take too long?
Go to servo
Make sue vehicle level
Fill up to first click
Set Odo at zero
Drive 20, 40kms -further if you want better accuracy
Go to servo and fill up to first click
Divide no of kms travelled into 100
Multiply this figure by no of litres
This gives litres per 100km (the recognised standard)

Can't see that that would take long. Might help to start in NSW and finish in Qld then no time at all

20-40 km will return pretty inaccurate figure. 50+ litters of burned fuel will give better result and obviously only can be done quickly on freeway, not in city. Plus factors like cold car in the mornings, heavy traffic, use aircon etc.

Serg

"Quickly" is not possible in a 1HZ diesel... maybe if you turbo it.......;-)

Cheers

Simple. If you do something trying to improve your fuel consumption it would be nice to know what you are getting ASAP. Plus I have two sets of rubber and changing them often. Because they differs in diameter odometer reading and therefore fuel consumption getting skewed.

Cheers
Serg.

Problem is keeping all of the conditions the same.
Same road, same traffic, same throttle settings, same temperature, same wind (head or tail) or drive same distance there and back.

So maybe do as suggested above and fill to first click at a highway servo not too far away, do 50k down and back then fill to first click.
Maybe use cruise control so same throttle is used on the same hills.
Maybe the same time at night to minimise traffic.

Would guess it would only pick up major differences over 10% though :o)

I have done similar measurements going Brisbane to Gold Coast when working there. Took figures every few days over a period of 6 months and found it varied from 9.3l/100k to 13.4l/100k. Traffic, headwinds and speed made that much difference.

Ps - forgot to mention, one thing I was also playing with was tyre pressures so see what difference it made.

Hi Oldplodder,

you are spot on. It is very difficult to measure accurately due to numerous factors you have mentioned. Thus only big difference became noticeable.

Cheers
Serg

Thanks - mine is diesel :-)

Cheers
Serg

Thanks - good though expensive hint.

80 1HZ pretty much mechanical - no engine ECU, so not good :-)

Cheers
Serg