I am renting a car for 10 days, 7 of those days are covered by the company and 3 of those days are myself. It is a road trip whereby I want extra time to visit more cities during the way back.

The first 7 days will be on company time and the latter 3 days are personal vacation. The issue is that it is a road trip so dropping off the car between 2 contracts is not an option.

Also my company is very particular that the credit payment amt needs to match the bill amt. So there a possibility to rent a car for 7 days, and then have a "late fee extension" with the car company and I pay that out of my own pocket?

What kind of options are there?