>
> Another interesting tidbit to consider though is that modern cars are
> MUCH more sensitive to the cold then older cars. My Olds didn't even
> notice when it was -20C, it's fuel economy remained exactly the same.
> OTOH my current car goes from 8.5L/100km in the summer to nearly
> 10L/100km in the winter, a dramatic difference. I thought something was
> wrong with the car, but my brother has a car with the exact same drive
> train and had the exact same result.

Any idea why? I'd expect the engine temperature to stabalize pretty
quickly. Tire efficiency also varies with temperature, but again, I'd
expect them to warm up pretty quickly. So... what's temperature sensitive?

Speaking of tires... Has anyone seen rolling resistance ratings on tires?
How much efficiency gain could we get by using "high efficiency" tires? It
sure makes a difference on a bicycle! But maybe tire losses are much
smaller than aerodynamic losses on a car due to speeds?

Harold


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