A cooler thermostat will lead, in general, to lower MPG, because of the way the way the ECU interprets the signal from the Temp2 sensor. Unless you drive in the desert alot, or always tow a trailer, hotter is better. The cooling system in a waterboxer Vanagon could handle general duty cooling for a small V-8!

Matthew Snook <matt@SNOOKSBAND.COM> wrote:  I have no clue what thermostat is in mine. I just bought an '84 Westy with
a nice running 1.9 that runs pretty cool. At highway speed the needle
rarely leaves the lower mark. Sitting at idle, it will go up to where the
needle almost touches the little red blinker (which is not blinking...:))
Even on the longest climb I normally do (3000 ft +) coming up out of
Pendleton the guage doesn't move a lot.

Is there a problem with running that cool, however cool that is?

Matt

-----Original Message-----
From: Vdub Guy
Subject: Re: 2.1wbx into 85 GL

...Also, following Jim's write up, I used the cooler thermostat, and my
gauge rarely ever reads above the 1/4 mark. Jeff