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
12 mpg
14 city 17 hiway
apx-14 city-18 freeway-
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.