@Romet.Lyytsepp I suppose it varies according to the amount of fuel in each loco. This one's crew radioed the diesel service facility HQ to ask if they'd be getting filled up and were told no. So that means they would probably have enough to reach Amarillo, TX, or at least Wellington, Kansas. Chicago-KC is about 450 miles and KC-Amarillo is about 500, so maybe they get 1000 miles per tank (5000 Gal.); Five gallons per mile? (My math skills are weak:))
@Romet.Lyytsepp These two started in Chicago, might receive fuel at KC, Amarillo, TX, and Belen, NM, or whenever they need a 500-mile inspection of the train. Chicago-LA is about 2000 miles.