1996 Chevrolet Astro Owner's Manual - Page 210

YOUshould keep a record with all parts receipts and list the mileage and the date of any service work you perform. See "Maintenance Record" in the Index. I NOTICE: If you try to do your own service work without knowing enough about it, your vehicle could be damaged. Fuel Use regular unleaded gasoline rated at 87 octane or higher. Use premium unleaded gasoline rated at 9 1 octane orhigher for high power performance, when towing a trailer or with a high payload requirement. But when operating with a light load as a normal condition, you may use middle grade or regular unleaded gasolines. The gasolineyou use should meet specifications ASTM D48 14 in the United States and CGSB 3.5-92 in Canada. These fuels should have the proper additives,so you should not have to add anything to the fuel. 6-2