I think the 87 C t-stat will do well for you up there in the PNW. But
don't expect any change in mileage. It seems to make sense that a cold
engine would be less efficient, but my mileage did not change.

Keith

On May 11, 2009, at 11:07 PM, Loren Busch wrote:

>  What everyone is saying has confirmed my suspicions.  First, the
> thermostat isn't working right.  Second, that I have the 80 C
> thermostat and that makes sense since the van came out of the
> Central Valley in California before I bought it.
> A new 87 C thermostat is on it's way.  Let's see if running at the
> right temperature makes any difference in gas mileage.