Ted and Marshall begin the story in Marshall's Pontiac Fiero. The car is about to hit 200,000 miles on the odometer, and Marshall is excited, since the Fiero has served him well. He even has cigars in the glove box ready for the occasion although, upon looking, Ted can only find two sets of chopsticks. However, Marshall hits a pothole, and the Fiero quits running just before it hit 200,000 miles. In the shop, Marshall is saddened, and everyone begins sharing stories about the Fiero.
Marshall tells the story of how he had to prove himself worthy in the eyes of his brothers by ordering 12 cups of coffee at the drive-thru while sitting naked in the front seat (his brothers jumped out and surprised him, causing him to jerk the car and make the hot coffee spill all over him). He also uses this to tell why he has never allowed food or drink in the Fiero (not even groceries). Ted then tells his memorable moment with the Fiero, known as both "Fieroasco" and the "100k Fiasco" (the Fiero was approaching 100,000 miles at that time), which began during their freshman year of college, when Marshall offered to drop Ted off at his parents' house in Ohio on his way home to Minnesota for Christmas break. Ted tells of how they got lost on a back road, had to cuddle together to stay warm when a snowstorm hit - and found out they were parked in front of a small bed-and-breakfast with a man and his dog staring at them the next morning.
Lily and Robin feel the need to come clean about something, and they tell Marshall about the time they took the Fiero to get Thai food but spilled it in the passenger compartment. They carefully cleaned it up, smoked the cigars that Marshall had been saving for the passing of 200,000 miles, and wrapped two chopsticks in napkins, hoping Marshall would never discover what they did. Finally, Barney says that he doesn't understand any of their feelings for the car. Ted then tells of Barney's only memory with the Fiero, which was the time Ted taught Barney how to drive in it, and Barney was scared of driving ever again (even though he never left the parking lot or went much above 10 mph). Although all five of them attempt to push the car to 200,000 miles, they give up, and say goodbye to the car. Future Ted states the remains of the car were sold for enough money to help pay the gang's bar tab for two nights after.