litres and mpg

[fred]

We buy fuel in litres but still talk about milos per gallon. Whats the metric equivalent any way ?

[The Natural Philosopher]

litres per hundred kilometers.

Under ten = good, over 10= bad. 10l/100km=23.5mpg.

[Tim+]

An abomination called litres per 100km. Utterly against nature and all things right.

Tim

[Theo]

Go on, tell us how you really feel about kWh per 100km...

[John Rumm]

Nothing wrong with kWh, but putting a power of 5 in your units of measure is bad practice.

(km/litre, would be a more natural measure)

[Tim+]

See above. ;-)

Tim

[Theo]

The problem with mpg and lpkm is they're reciprocal units, so they're nonlinear. A mpg means different things depending on what baseline you're talking about. So a 3mpg improvement is much better on a 10mpg car than a

10mpg improvement on a 50mpg car.

while with l/100km every litre is worth the same.

Theo

[SteveW]

It's not a problem. It is clear that a car that achieves 50mpg is 5 times more fuel efficient than a car that only achieves 10mpg and most people (without a particular journey in mind) want to know how many miles they get for a set volume of fuel (particularly a full tank).

[John Rumm]

Which I am sure few people care about most of the time. The important question is what range do I have with the fuel remaining, and how far can I go on full tank, and how many fuel stops will I need for a given journey.

Only really of interest when choosing a new vehicle...

Even then, just convert the MPG change to percentages and you are good to go. No need for bastardised units like l/km x 10^5

[williamwright]

The price rises don't affect me because I always stop the pump at £30.

Bill

[Jim Stewart ...]

but but you get less ????

[Jim Stewart ...]

don't care but I have to add 10% to my Mustangs indicated mpg ....

[Jim Stewart ...]

which brings it up to about 19mpg...f*ck you Greta

[Andy Bennet]

As far as I am concerned miles/litre. 45mpg = 10miles/litre so its easy to calculate my running costs in pence/mile which equates to (cost per litre in pence)/10.

[Clive Arthur]

28mpg is about 1 nanoare.

[Matthias Czech]

Don't think so. Nanoare ist an area. Mpg isn't.

[Clive Arthur]

Mpg is reciprocal area. 28mpg is 1/28 gpm which is an area, ie volume divided by length.

[Matthias Czech]

Hm. I am puzzled. 1m/s is a velocity. Is 1s/m also a velocity?

[zaq]

Nope, just distance, not area and engine efficiency.

Nope, because the volume and length aren't of the same entiry.

[Clive Arthur]

Christ, Rod, you're thick.