[Vwdiesel] VW diesel exaust sound

[James Hansen]

It only gets from 9 &  one
> half to 10 MPG. I think it needs a new thermostat as it only runs
> around 140 degrees F under normal conditions & suspect this
> contributes to poor MPG.

Absolutely.

  I wonder if removing the muffler would help
> fuel economy? 

Yes, to a point.  Depends what is there now.

However, this is a heavy rig weighing about 20,000
> pounds.

Should do better. I do way better than that with a truckload of grain 
and a 350 mack.  Yours may be a tad underpowered maybe??
-james

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