Anywhere from 3000-5000 miles with conventional oil, but it varys based on driving conditions. If you are interested in extending oil changes, check out www.blackstone-labs.com for information on having your oil tested to make sure it is still good to use for longer intervals.
18-20.
18-20
My 95 Chevy Astro van averages 15 mpg in the city. I do not know what it gets on the highway. It has a 4.3 L V6.
21mpg
The Chevrolet Astro has a chain not a belt.
I am assuming you meant fuel pump last on an Astro. I know several owners of Astros and usually they fail at about 140,000 miles.
The Chevy Astro was a van produced in 1990-2005. The it is rated poor in fuel economy averaging around 15 miles per gallon. You can pick up a used one for under $2000.
3000 miles on oil and filter, Then change
It is claimed that the Chevy Astro cargo van can average about 28 miles to the gallon, but this will depend very much on the type of driving conditions. It driving is in a busy urban area, fuel consumption will be lower than when driving on country roads while maintaining a steady, moderate speed.
60000 miles
Every 2000 miles
They recommend 30,000 miles.