On 20 Jan 2007 08:05:29 -0800, "Harry K"
wrote:


Because a 'unit' is a much more useable measure for that much volume.
Much easier to look at a bill and see "oh, I used 3 units this month
instead of the usual 1' rather than seeing the volume in thousands of
gallons.

I think if this were designed for single family homes, it would be
better to use an average of 30 units, for example. So one wouldn't
have to cut or increase his usage by a whole third to see the number
change.

Same reason some items are measured/sold by 'hundred weight' or 'tons'
vice pounds.

Harry K