Tuco69 posted:

G'day Old Soldier - I went to the conversion page and found that something doesn't add up!

Given that there are 4.546092 Litres in an Imperial gallon and 1.609344 Kilometres in one Statute mile - then by my maths (questionable accuracy) 4.546092 divided by 1.609344 equals 2.8248106 - which is then used as the conversion factor for MPG/KPL.

So 10KPL should be 28.248106 MPG.

However the conversion page shows that 10KPL is 23.53MPG !!

Working backwards from this, it seems that whoever created the page has used the litres to gallons(US) figure of 3.785411784 incorrectly!

3.785411784 divided by 1.609344 equals 23.521457...

Bit strange using US gallons on an Aussie site!

Tuco in Cairns

Iamgq posted:

Hi Tuco69!
The Page is correct. If you consider one gallon liquid(US),
it equals to 3.785412 litre..........not 4.546092 litres which is used by UK.
So, as this site probably constructed by American so it use US liquid Gallon.....not UK gallon...
so if you use 3.785412, you will calculate 23.52MPG

here is a very good site for unit conversion http://www.onlineconversion.com/volume.htm

you will be amazed if you know there are so many units are there.

Tuco69 posted:

G'day Iamgq,
sorry but I disagree with you!

The site at http://www.metroyamaha.com.au/tools.htm is an AUSTRALIAN site. Note the presence of 'au' in the URL address.

Here in Australia we always used Imperial measurement for liquids prior to when Australia went to metric. All measurements wether they were fluid ounces, pints, quarts or gallons were based on the Imperial gallon.

I worked in the Oil industry at the time Australia went metric. The official conversion factor for gallons to litres was 4.54609 . This is the figure that all Customs and Excise duties are calculated with. A practicle example of this is the 44 gallon drum which became a 200 litre contailer with minor adjustments to dispensing equipment.
44 gallons (IMP) x 4.54609=200.02796 litres

So the AUSTRALIAN page refered to above is NOT correct if it uses the US gallon conversion factor.

Sorry, but thats the facts ...

The site at http://www.onlineconversion.com/volume.htm is an American site and can easily be distinguished as such when they refer to the Imperial gallon as a gallon(UK) and also spell 'litre' as 'liter'.
'Litre' is is spelt using 're' in both the Oxford and Australian dictionaries. American dictionaries spell it with 'er' .

We may have to follow our blind leadership into war with the Americans, but certainly don't need to talk, spell and calculate using their figures!

Tuco

Tuco69 posted:

As a follow up, I contacted Metro Yamaha and they have now updated the page to include both US and Imperial gallons ...
>

Tuco

Mikef_patrol posted:

Bugger

"To get L/10KM just divide " should read "To get L/100KM just divide "

MikeF

Mikef_patrol posted:

Doh!, Must be too early in the morning

"To get L/10KM just divide 100 by your KM/L figure and voila!, L/100KM. (ie 300/35 = 8.571...=KM/L) "

Should read

To get L/100KM just divide 100 by your KM/L figure and voila!, L/100KM. (ie 100 / 8.571...= 11.67 = L/100KM)

MikeF

Savvas posted:

Even easier way to get L/100km-

Divide your Litres by the Kilometres covered and move the decimal point 2 places to the right.

David posted:

Well bugger me! How simple is that. This metric stuff has confused me and I still only work of mpg but at last a simple method without those fancy conversions lite take the litres divide by the Km multiply by pie r squared add the square root of the number you first thought of then add to that the cost of a pie with sauce to then realize you pressed the wrong button and have to start again.

Thanks Stephen for keeping it simple.

Old Soldier posted:

I agree with David

Well bugger me !!

I think even my tired old "M.P.G." brain can work that out. :)

Thanks Stephen

Stephenf posted:

Yeah, and I even managed to invent a new word - "proportionately". Before all the English teachers jump on me, I meant "proportionally".

Also, for those of you who use a spreadsheet to keep records of your fuel consumption, the formula is litres/100kms = 100*Litres used/Distance travelled.

Stephen.

Peter posted:

stephen
not trying to be smart but i get 15ltr/1ookm and thought it was 18.8 mpg
peter

Stephenf posted:

Peter, yes you're right. I simplified it too much. The relationship is logarithmic, not linear. While 10 litres/100kms = 28 mpg, 5=56 and 20=14, the in-between values are a bit less than proportional, eg. 15=18.8 instead of 21. Sorry about that.

Stephen.

Stephenf posted:

But unless we all do it the same way we won't be able to easily compare figures. For example, km/l means nothing to me because it's a non-standard way of expressing fuel consumption. I have to divide 100 by that figure to get litres/100km, which is a standard figure I can use for comparisons.

Stephen.

Brian posted:

You can say it is "non-standard" becaause it is not the offical method,
But it still does not make it the better system for calculating fuel economy (eaiser maths in km/l). Many People I talk to think that the higher the number the better you are (l/100km system) they still think the old way (mpg) but with new units (metric). I understand what you are saying "unless we all do it the same", but IMHO at the end of the day l/100 is really a usless figure ,it needs to be converted to make any use of it. Each to his own!
Brian