Welcome to ecomodder, Mike.
I find instant feedback really helps to improve mpg by driving more efficiently.
The van looks to be too old to have an OBD2 port which would allow a scangauge to be used, but an mpguino might be suitable with some wiring and calibration.
Removing or fitting smaller mirrors to replace the large ones it has should help a fair amount, as well as a simple air dam or a full undertray.
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