Better contact your agent to find out what your rental coverage is in the event of a car accident. 

What is the difference between a $25 per day rental and $50 per day rental?

 $25 a day

 $50 a day

Hint - email your insurance company and increase your rental car coverage on your auto policy before you try to fit a child's car seat, or your in-laws into a compact car like Mitsubishi Mirage or Nissan Versa.