I received help a day or two ago.  I'm still working on the same gas
consumption database I needed help before.  Here's the confusion I'm facing
now:

When I closed the Query and returned to the Report design, Access displayed
“You tried to execute a query that does not include the specified expression
‘ID’ as part of an aggregate function or grouping.

‘ID’ is the Access assigned record number.  In the Query design grid, I had
set its criteria to >1 to make sure the Query didn’t include the first record.

Here is the first column of the design grid.

Field    ID
Table    96 Voyager-2
Sort
Show    checked
Criteria  >1
Or:

Apparently, I’m again missing something!  Adding that criteria for ID seemed
to make sure no data from record #1 was included in the report, but this
message has introduced a bunch of confusion.  Any ideas will be quite welcome!