There is a lot of info in your point of sale software, that is interesting to know and cost you nothing to get. Its a freebie so to speak. Here is one.
Go to End of day > Reporting > Average Basket size by hour
Now put in a date
See how the basket size varies in your shop by the time of day.
We have broken it down by retail sales and account; generally, we see that the account sales have higher basket sizes.
Put in a range of dates and I am sure you will find much interesting.