[1/2] New Fiat Panda and Fiat 500 mild-hybrid cars are seen in piazza Maggiore, in Bologna, Italy, February 4, 2020. REUTERS/Flavio Lo ScalzoLUXEMBOURG, Nov 8 (Reuters) - Fiat Chrysler on Tuesday won its fight against an EU order to pay 30 million euros ($30 million) in back taxes to Luxembourg, dealing a major setback to EU antitrust chief Margrethe Vestager's crackdown on sweetheart deals between EU countries and multinationals. In her 2015 decision, Vestager said Luxembourg had granted Fiat Chrysler, now part of Stellantis (STLA.MI), an unfair tax advantage by endorsing artificial and complex methods that artificially lowered the company's taxes. Judges faulted the EU competition watchdog for its analysis of the reference system used to determine whether Luxembourg had given a selective advantage to Fiat. Vestager's high profile cases include her record 13-billion-euro tax order for Apple (AAPL.O) and Amazon's (AMZN.O) Luxembourg deal.

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