However, you can expect the EPA estimated MPG to be in the range of 16-20 mpg combined (city and highway). Highway mileage will generally be higher than city mileage. Actual mileage will also depend on driving style, vehicle condition, and other factors.
To find the *exact* MPG for a specific 2001 Chevy Venture, you'd need to check the sticker on the vehicle (if it's still present) or consult the owner's manual. You could also check online resources like the EPA's FuelEconomy.gov website (though they may not have data for every specific trim), or look up fuel economy information specific to the engine size (3.4L V6 is the most common) of your particular vehicle on sites like Edmunds or Kelley Blue Book.