Volks, I have replaced the Temp II Sender, the O2 sender, and the
thermostat; also front square fuel filter and spark plugs. All grounds
show continuity. The van starts & runs very well, as it has all along.
The temp gaugue now shows medium temperature (just to left of LED)
instead of low.

But we're still getting only 13mpg. This is better than 10mpg, but
still not her normal 18-21mpg.

Now what shall I look at? The van is en route to Grants Pass without
me, but should be back in Portland next week.