Mourey made his decisive move 3km from the line as he raced clear of a pack of 18 riders with team-mates Johan Le Bon and Anthony Geslin in tow.
The 32-year-old stormed through the 203.8km of roads through the North Finistere as his FDJ team completed a fine French treble with the top three places occupied.
Mourey recently won a stage at the Circuit de la Sarthe and was dominant in winning the race, the eighth round of the Coupe de France.
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- Anthony Geslin