Not necessarily an advantage unless he's hiring at a dry rate...
and
If you would like some challenges, do a flight up to 10000'. Not necessarily difficult but sets a few issues for you to think about.
One of the worst taught / least understood controls in an aircraft - especially at commercial level. Perf charts are all “with the aircraft appropriately leaned”. A good pilot will always lean to the most efficient setting not only to save fuel but also to get the best performance at that altitude. Not even thinking about going “green”.
I used to make a student take full tanks and then fill on return just to have them check how accurate they were with their planning.