In Sanford, Maine, trash is down 50% in the first month of PAYT.
According to one national blog, "the 50% decrease in garbage tonnage far exceeded the town manager’s expectations. If projections hold true, this town of 21,000 in southwest Maine can save about $250,000 in garbage tipping fees, crucial as the city will face a 20% price increase in the service after the new year."
Here's more:
http://www.triplepundit.com/2010/08/sanford-maine-boosts-recycling-through-trash-metering/