Talk:Euro Supercar Duel/@comment-99.251.150.111-20150810031316

Most economic way to achieve 100% for me was to upgrade the Mercedes to 47.0 using 55 Gold to get to 26/29. You do not need the last engine (42 G), Body (9 G) or suspension (16 G).

Note that for 100% completion of Grand Tourer Supremacy Series I think it's cheaper to upgrade the Mercedes-Benz SL 65 AMG Black Series to PR 48.0 (rather than the SLS AMG) as you already need to get it to 47.0 for 100% completion of the Luxury Tourer Tournament.