“Becky Sue,” a 38-year-old Mississippi River tugboat, is sporting a new pair of fuel efficient, 600-horsepower diesel engines thanks to Project Green Fleet, a program sponsored by Environmental Initiative. Project Green Fleet is a voluntary program that upgrades diesel engines with pollution control equipment. Flint Hills Resources is proud to partner with Environmental Initiative on Project Green Fleet, which recently completed the improvement of 3,000 school buses across Minnesota with new emission control technology.