If l am doing GJ in your circumstances, l will put in at least 6 trips in the morning during 6am-9am which minimum 4 is peak hours trips to qualify for $100 gross fares. Then l will start a bit earlier in the evening and try hitting the 18 points mark ASAP. Another 4 peak hours and 4 non peak hours trips. Once l hit the 18 points mark for total of $50 points incentives. I will cherry pick to hit the 9 -11 trips tier with any remaining time.
So minimum returns will be $100(6trips)+$125(9trips)=225X0.8=$180+$50=$230 nett fares. Bear in mind you have two bullets before 18 points mark and unlimited bullets after that. So it is possible to hit 11 trips or even 13 trips for the evening if you are lucky.