So we have a 4 day trip planned for Oct 2023. I got a reservation from Costco like always. Budget intermediate for $204. So we thought maybe we will add a day on. I check the price for 5 days and it is $448. I figure that it must be the days of the week and we don't care about what days we go so I shifted the days. Same price. As a matter of fact if you pick any 4 day stretch and then check the price for any 5 day stretch in Oct or Nov, you will get the same increase. Now 6 days is $455 and 7 is $469. I have rented cars well over a hundred times, mostly in FL and never noticed this. Has it always been this way? Why do you think the rental companies decided 5 days is when we take you to the cleaners?