Testing has been conducted on a PC using version 1 and version 2 scripts.
Update: Confirmed by Jack Reacher on PS2.
Mission: Two-Timing Date
BP/FP/DP/EP Monster B
BP/FP/DP/EP Police Rancher
BP/FP/DP/EP Feltzer *
* For some reason Millie is driving a Pink Feltzer instead of her usual Club.
Drive a Tow Truck, or leave a Tow Truck near the girlfriend's home during the date. Trigger a Two-Timing date. When the jealous girlfriend appears, lead her to the home of the girlfriend being dated. Wait for the jealous girlfriend to come close before entering the mission sphere and then wait until the jealous girlfriend speaks and proofing to be applied before turning down or accepting an invitation for coffee. If CJ will not be invited for coffee then wait until the jealous girlfriend is very close before entering the home sphere of the girl being dated.
Chase down the jealous girlfriend. Avoid shooting or she'll drive off in a hurry. Back into the car with the Tow Truck and bump the car to coax the girlfriend out of the vehicle (sometimes works) and then take the car and save it in a garage. The doors are not locked after they exit. If she doesn't exit the car then hopefully she will try to ram CJ's vehicle instead of racing out of sight and disappearing. Hook up the car to the towing vehicle and tow the car to a save garage. Keep her pinned in the garage and allow the door to shut; the girlfriend will disappear and the car can be saved.
One-Time Two-Time Theory
If Two-Timing dates are not disabled and CJ has more than 1 girlfriend then there is a 50% chance that any other active girlfriend will appear as a jealous girlfriend 7 seconds after leaving or failing to reach the destination, or completing or failing the goal. Gimp Suit dates and She Drives dates do not trigger jealous girlfriends.
Two-Timing dates will be permanently disabled when CJ goes on a date that is not a Gimp Suit or She Drives date and leaves or fails to reach the destination (Food or Dancing), or completes or fails the goal (Driving, Drive-By):
- if only one girlfriend is active
- if a jealous girlfriend does not appear
- if the jealous girlfriend is evaded
I believe these are the only proofed vehicles that can be collected without triggering a story mission. Since Michelle, Katie, Barbara, and the Doherty save garage are available at the beginning of the game it is possible for the Monster B, Police Rancher, and/or Romero to be collected without completing any story missions.