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That's really good for these vans based on my experience. We usually average 15, mostly in town driving. No fun filling up these days, but gotta feel sorry (not really) for these guys with their huge pickups that I understand only get around 12.
Our best was during a trip out west in Wyoming between Cody and Casper in our 97. Flat straight road for a couple hundred miles. Going a steady 70 we averaged 23 with the van FULLY loaded and the AC on. Never touched that before or since. Maybe Wyoming had better gas...

You state your van is 30 years old, so its a 92? That would explain the conventional (non iridium) plugs. Not knowing better I put conventional plugs in the 97 prior to the trip. No problems with them, did put iridium in subsequently bc guess that's what 2nd gen is supposed to use.
 
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