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Yes, Chevy conversion get good gas mileage but it's not best compare to japan van. You can search around to look for customer reviews and decide which best for you .
12 mpg
8-16 mpg
I get about 14 mpg highway.
I believe I get around 22 mpg
K&N air filter is the best way
Inside the gas tank
need to know normal gas mileage for 96 astro van
I get around 17 mpg with my g20 with the 350 motor \3.42 rearend
i get 16 to 18 depending on the traffic and that is about 20 on the highway
The average gas mileage on an average van (2012 Chevrolet Express) is 13 miles in the city and 17 miles on the highway.
14mpg-19mpg...