On 09/16/2013 10:28 AM, Oleg Goldshmidt wrote:
guy keren <guy.choo.ke...@gmail.com> writes:
actually, driving at 70-80kmh is usually MUCH MORE fuel-efficient then
driving at 110kmh, in most cars and under most road conditions...
This may *still* be true for many cars on Israeli roads, but it should
not be regarded as some law of nature or engineering, and it is not a
universal constant. Chances are, it no longer holds for many newer
models (or for any: I'd say the sweet spot was around 90km/h 10-15 years
ago for family-sized cars). The exact number is less important than the
dynamics, in my mind. So let's consider how it evolves.
instead of going into theories - does your car have a fuel consumption
computer?
if it does - please perform an experiment:
reset the counter before your next two drives on the highway. on the
first drive - drive at 110km/h. on the second drive - go at 80km/h.
perform the two tests on a flat area outside the city (i.e. reset the
counter when you're outside of the city).
then come back with the results.
i did this in the past, both on the Prius (2008 model) and on a renault
megan (2000) - the difference was noticeable, in favor of the slower speed.
when you perform a similar experiment in europe (again, with a computer
that measures fuel consumption), with a european car - then we can
figure out whether these theories agree with reality.
--guy
- in theory - there is no difference between theory and practice.
in practice - there is.
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