User blog comment:Na299/Ways of Gold Farming/@comment-26388545-20150526205247/@comment-123.124.240.12-20150528035226

Yeah, the $RS for upgrades is really an issue for gold farming like this. Before I start SFC and SRT, I prepared about 2M $RS for this because I know F14T is really expensive in upgrading.

And I prepared to use gold to upgrade if necccesory (if I can keep 66 golds for each event then upgrade using 20 gold for engine shall be acceptable :))