Leopold Center for Sustainable Agriculture, Agricultural and Biosystems Engineering
This analysis found that locally grown produce traveled an average of 56 miles from farm to point of sale, compared to an average of 1,494 miles for 30 types of produce from conventional sources.
Iowa State University
Pirog, Richard S. and Benjamin, Andrew, "Checking the Food Odometer: Comparing Food Miles for Local versus Conventional Produce Sales to Iowa Institutions" (2003). Leopold Center Pubs and Papers. 130.