** Super Retail Group SUL.AX falls as much as 7.1% to A$16.03, lowest since August 20
** Stock marks largest intraday pct fall since late February
** Supercheap Auto owner terminates CEO and MD Anthony Heraghty with immediate effect; names current CFO David Burns as interim CEO
** Says board acted on new information about Heraghty's relationship with co's former chief HR officer, concluding his earlier disclosures were inadequate
** YTD, SUL gains 10.3%
(Reporting by Kumar Tanishk in Bengaluru)
((Tanishk.Kumar@thomsonreuters.com; X: @thatstanishk http://www.x.com/thatstanishk;))