We need a formula to do the following:
Subtract a given reading from the one previous to it and divide it by the number of days in between.
That average number then goes in a column.
The other BIG problem is that meter readings are never on the same day month to month.

Example:
Date Meter Volume
1 18,179,000
2 3,000
3 3,000
4 3,000
5 18,191,000 3,000
6 2,500
7 18,196,000 2,500

I truly appreciate any help that you can provide....Im turning blue trying to figure out myself.
Dee