[The_Oz]

I'm just wondering who else sees a big difference in fuel consumption at wintertime.

Is it only me - and should I have a closer look at the fuel-system on the 968, or is it rather normal?

Summer time - upto 12 km with one liter of fuel ... the last two weeks .. plowing in the snow [img]style_emoticons/<#EMO_DIR#>/cool.gif[/img] ... max. 8 km's with a liter [img]style_emoticons/<#EMO_DIR#>/dry.gif[/img]

<i>It's not been below -10 ... most of the times somewhere between -5 and pls 2 degrees centigrade.</i>

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[Cloud9...68]

I don't drive my car regularly enough to track its gas mileage, but I wonder if your issue has to do with the formulation of gasoline in the winter. Here is the US (Texas, in my case), the formulation changes in the winter, such that gasoline can contain up to 10% ethanol. Ethanol has a much lower heat content that gasoline (about 67%), so mileage will naturally suffer if there is a significant quantity of ethanol in the gas. But I'm not sure if the Netherlands isin this situation, as the use of ethanol in the US is a very political issue, funded by the powerful agricultural lobby, which sells ethanol as the savior of all our energy problems, when it is in fact a very crappy fuel, frought with endless economic and environmental problems. But unfortunately, money talks.

But I'm not sure gas forumlation alone would account for your large drop in gas mileage. Is this the first winter you've owned your car, and if not, do you observe this drop every winter?

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[The_Oz]

<i>Cloud9...68 wrote: But I'm not sure if the Netherlands isin this situation, as the use of ethanol in the US is a very political issue... </i>



Forgot to mention that I'm driving the 968 in Norway at the moment - but it's a good point and I will investigate that.

I bought the 968 almost a year ago - and drive it like I did with the 911's before (all year) .. never seen this big change over the last 10 years ... [img]style_emoticons/<#EMO_DIR#>/dry.gif[/img]

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[Kim]

Here in Canada gasoline volumes are "corrected" to 15C. This means that, in winter, the volume that you get is presumed to be at 15C but, since it might be 0C, the actual volume is less. Not sure what the coefficient of expansion is for gasoline but the volume that you get is likely a fair bit less than what you pay for. Also, at cooler temperatures, air is more dense so more fuel can be added into the combustion chamber to keep the ratio of fuel:air correct. You also probably get a bit more power. Finally, lights, fans etc use more current and it has to come from somewhere. I keep track of fuel consumption by the month and consistently get a calculated consumption in winter (of course less driving also) about 90% of what I get is summer.

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