What miles per gallon does a Chevy astro get highway?

The highway MPG for a Chevy Astro varies significantly depending on the year and engine. You won't find a single answer. Generally, expect to see figures in the 18-22 mpg range for highway driving, but some models might be slightly higher or lower. To get a precise figure, you'll need to specify the year and engine size of the Astro in question.