It's no secret that buying a used car instead of a new one can save you money. New data from iSeeCars, however, reveals just how substantial that savings can be. The automotive research firm and car search engine found that the average 1-year-old used car costs 23.2 percent less than its original price. What's more, some models provide even bigger savings for used car shoppers, offering a price difference as high as 38.5 percent or $24,690 between the new and lightly used versions. iSeeCars analyzed 7 million new and used cars to identify those with the greatest price differences. Here are the cars that topped the list.