In an earlier contribution to this discussion,
Steven Briggs wrote:


The fairest way to make an estimate may be pro-rata with number of
days - but that wouldn't really work in the spring when consumption
is going down with time.

Or in this case the autumn quarter, with consumption rising through
October and into November.
TBH, I think the OP's bill was fine, I would expect
mid-October-November consumption to be at least twice that of
September-mid-October.

Quite. The point which I was trying to make - maybe not too
successfully(!) - was that if a price increase had occurred in the spring
quarter, where the daily consumption was going *down*, the OP would have
objected to an estimate based on a flat rate of consumption. But he would
have accepted a flat rate in the autumn when consumption is rising. He can't
have it both ways!
--
Cheers,
Set Square
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