We hired two different cars in a month period with Sixt (in two different cities) and this is for the second hire. Staff were friendly and did a thorough review of the car before we took it away
Compared to the first car we hired, it wasn't a very economical car in terms of petrol - it burned through fuel incredibly quickly, and wasn't very efficient in changing gears (an automatic) which didn't help matters. Considering the other car we used was smaller, it was a lot more efficient, so I wonder whether it needed a service. We were also told to call the team when we dropped off the car so they could inspect it, but the phone was constantly engaged, so we had to walk to the other office to get someone. No one was on the phone, and it was really quiet, so not sure why the number didn't work. Luckily, it didn't cause an issue.