Sarah Berger, “The Cashlorette” of TheCashlorette.com (a Bankrate, Inc. company) a personal finance blog for young women, reveals the most valuable college major. Petroleum Engineering tops the list of college majors, according to a new report from TheCashlorette.com. The study examined median incomes and unemployment rates for U.S. adults with only a bachelor’s degree across 173 different majors.