The cost to rent a car for a week is getting close to the cost of just owning a car. (very much it depends, if you only own new cars renting is cheaper, but most people own older cars which are much cheaper). Plus when you rent they worry about little scratches and such which limits what you can do on vacation.
I’m not sure what math you’re on, usually the metric is 1-2 months to match ownership.
I recently hired a small car for £20 a day. Not a special deal, that’s just the price. A week would make that £140. An old car would cost almost twice that in taxes. Then you have maintenance, insurance, MOT, and devaluation.
If you can use a small car. I have a family, so I need a larger car (minivan, but typically they give me a large SUV). $100/day. A used minivan amortized over years is pretty cheap.
