> On Tue, 2006-05-09 at 09:27 -0700, Harold Hallikainen wrote:
>> >
>> > 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?
>
> Nope, no clue. Using a block heater didn't seem to have any effect, so
> warm up time doesn't appear to be the issue.
>
> Considering how abrupt the change in mileage is I wouldn't be too
> surprised if someone came up to me and told me the computer has a "cold
> weather" profile and a "warm weather" profile, and that the cold weather
> profile gives up certain things (mileage) for other uses (i.e. getting
> the car warmed up quicker to prevent damage to the engine).
>


I wonder if it's fuel changes? Here we have summer fuel and winter fuel.

Harold

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