For the air not being directed properly, it's probably a vacuum hose.
The only full sized van I had was an '85 GMC conversion van with a 6.2 diesel. It usually got around 22-24 mpg on a trip, so I think 25 would be stretching it on a gasser. Best thing about that 6.2 was if you were on a trip and started with a full (34 gallon) tank in the morning, you couldn't drive far enough in a day to worry about refueling.
The worst thing about it, was when you fueled up, and were putting diesel in it, someone always came running, yelling that that was diesel you were putting in it. Everyone assumed a conversion van would be a gas burner.
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