** Auto1 Group AG1G.DE rises as much as 8.2% to 25.28 euros
** German online used-car retailer's Q2 revenue of 1.97 bln euros ($2.28 billion) beats analysts' estimate of 1.83 bln euros, per data compiled by LSEG
** Raises adjusted EBITDA guidance to 160 mln-190 million euros vs previous forecast of 150 mln-180 million euros
** Ups gross profit outlook to 890 mln-940 mln euros vs 845 mln-905 million euros earlier
** J.P. Morgan says results show business model on track and turning a corner
** Adds flagged investments under control
** Expects 2%-3% uplift to consensus estimates after guidance upgrade
** AG1G last up ~4%, takes YTD gains to 62%
($1 = 0.8653 euros)
(Reporting by Isabel Demetz)
((Isabel.demetz@thomsonreuters.com))