Board Thread:Game Discussion/@comment-27893266-20160809125826/@comment-90.202.220.20-20160810001339

One very clear candidate is the Merc SL65. You can achieve close to 100% in 2 bonus series with it. Upgrading it to PR48 and completing LTT and GTSS was a net loss of 14GC. But if you had all TT's done, then you can re-do 3+5 TT's for no less than 16 GC. Total, +2 GC.

Another case is the Maserati GT LTD series: you can get 75% completion with -1GC net. If you stopped at 75%, you can re-do the 4 TT's and get the bonus for 75% re-completion, going to a net win. Note that, for this to work, resetting the TT *must* drop you below 75% completion.