* Engine size: The Astro came with either a 4.3L V6 or a 4.0L V6. The 4.3L generally got slightly worse fuel economy.
* Transmission: Automatic transmissions typically consume more fuel than manuals (though the Astro was almost exclusively automatic).
* Driving habits: Aggressive acceleration and high speeds drastically reduce fuel economy. City driving generally yields lower MPG than highway driving.
* Vehicle condition: Proper maintenance (tire pressure, tune-ups, etc.) is crucial for optimal fuel efficiency. A poorly maintained vehicle will get significantly worse gas mileage.
* Load: Carrying heavy cargo reduces fuel economy.
Considering all this, you're unlikely to see highway mileage much above 18-20 MPG, and city mileage will likely be in the 13-16 MPG range. These are rough estimates, and achieving the higher end of that range requires optimal conditions and driving habits. Lower mileage is entirely possible, especially if the van is older, poorly maintained, or frequently driven in city traffic.
To get a better idea of what your *specific* Astro van should get, you might consult the owner's manual (if you have it) or check online resources that provide fuel economy data based on reported user experiences, but remember these are just averages, not guarantees.
