12.8 at the most
Averaging about 16 MPG.
My 1989 G20 van gets 15 mpg
About 210 hp
You can find a 1985 Chevy G 20 Van owners manual at most Chevrolet dealerships. Many auto-parts stores can order you an owners manual.
bad MPG 8 city 10 or 11 highway
apx-14 city-18 freeway-
14 city 17 hiway
12 mpg
For the All Wheel Drive model, combined Mpg should be 22 mpg combined. For the Front Wheel Drive model, average combined mpg should be 24 mpg.
I bought my Chevy G20 van new in Nov. 1975 and we're still using it to carry the large loads or for hauling trailers. It has a 350 engine and a 4 barrel carburetor and only gets 10 mpg. Interestingly, while pulling our 23' travel trailer, the van still burned 10 mpg!
8-16 mpg
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.