On 05/04/2018 10:27, TMS320 wrote:
On 05/04/18 08:42, Ian Jackson wrote:
In message , TMS320 writes
On 31/03/18 16:37, James Wilkinson Sword wrote:

That does make me laugh this hybrid bull****, you save **** all fuel
with those.Â* It's been shown that a diesel VW Polo uses less fuel
than aÂ* hybrid Toyota Prius.Â* Pointless waste of Lithium.Â* ALL
electric cars,Â* fine, but hybrids are pointless.

A diesel Polo will emit far more toxic material. Besides, miles per
gallon is the wrong measure when comparing petrol and diesel because
they have different energy densities. Miles per kilogram is the
proper comparison.

This may be interesting from the scientific point of view - and
especially when weight is just as an important factor as volume (which
it is, say, for airborne transport). However, for road transport, so
far we pay only for volume.

We pay...

We pay the oil companies for their costs in delivering the stuff to us:
their prices adjust the whole time and petrol is normally cheaper - by
volume. So their prices probably are a reasonable reflection of the
technical difference. It happens that mpg is always going to be simpler
and more convenient than miles per unit of fluctuating currency but it
still doesn't make mpg a good comparison.


Miles or km per MJ is probably the most scientific for comparison(or
even MJ per mile/km), but with the coming of electric vehicles will
probably stick with miles per kWh.