I've had a few coworkers like this over the years.
One drove a early 70's Nova and would get used tires from a really sketchy junk yard, since they would charge him $8 for a usable tire and rim. He would also get used brake pads, air filters, ball joints, etc..... from the same place. He spent a few weeks on the verge of a mental collapse when it was time to replace his worn out clothes washer. His Mom forced him to go to Lowe's and buy a new one on a CC. This transcaction had him unbalanced enough that he had to make immediate arrangements to pay the balance in full, before the bill came, since owing anybody $300 was more than he could handle ( he was 28 at the time, was making $70K + a generous benny package, looked like a late 40s, homeless bag of shit, and had $400K in the bank)
One was a young kid who was raised by multiple generations of extreme cheapskates. When his grand dad died, they discovered an attic full of hundreds of rolls of paper towels and hundreds of bottles of outdated, stale, two liter, store brand soda. This family would vacation, for months at a time, by stuffing six or seven adults in a minivan, staying in fleabag hotels (in one room), and cooking everything in the room. His girlfriend had enough when he stopped to grab a dirty sleeping bag on the side of the road, and took it home to wash it.
Another guy drove a 40 year old jalopy with a stick shift. He would park on hills, and be livid if he couldn't coast out of his spot to compression start the cars, since he wanted to get the maximum life out of the car's battery, and in his mind, using it to start the car was simply a frivolous waste.