** Shares of Australia's Guzman y Gomez GYG.AX rise about 3% to A$32.76, their biggest single-day gain since April 10

** The Mexican quick service restaurant chain says that 85% of its upcoming locations will feature drive-thrus

** Of the 220 restaurants it operates now in Australia, half are drive-thrus

** Stock hits highest level since April 30

** Stock down 19.4%, YTD

(Reporting by Rishav Chatterjee in Bengaluru)

((Rishav.Chatterjee@thomsonreuters.com;))