On the winter/summer bit, Garth, does the increased mass flow from
colder induction not balance it a bit for winter driving?
Chris
On 5 May 2008, at 16:09, Garth Wood wrote:
>
> Nope. The numbers I quoted are close to "best-case" scenarios. I
> live
> in Calgary, 300km from Edmonton, which my wife and I visit about six
> times a year. In summer, with all-season radials, cruise control and
> without significant headwinds or crosswinds, I can get there on
> one-third of a 60 litre tank, which gives me a fuel efficiency of 6.7
> litres/100km, or (expressed as the reciprocal) about 15km/litre.
> Multiply by 4.55 (to express it as km/Imperial gallon) and you get
> 68.25
> km. Convert to Imperial distance, and 68.25km is 42.41 miles, per
> *Imperial* gallon. If you convert to U.S. gallon, it's a conversion
> factor of 3.79/4.55, or 0.83 approx. 42.41 x 0.83 gives 35.3, or
> rounding, 35 miles to the *U.S.* gallon.
>
> All of the above numbers get worse if it's winter: transmission
> lubrication becomes thicker, joints are colder, winter tires have more
> rolling friction, the engine has to work harder. They also worsen if
> any of the initially-described variables aren't there -- if I'm in
> heavy
> traffic on the #2, I can't use cruise control. Bye-bye fuel economy,
> hello half a tank (30 litres instead of 20) for the same drive. And a
> significant headwind can wreck your fuel economy, too.
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