Letter Cites Health Benefits and Says Savings Would Require Emphasizing Cost-Saving Care -- Finding the Dream Blog (link to detailed analysis here).
The nutshell version --
some preventive care cuts overall long-term health care cost dramatically,
some preventive care cuts long-term costs moderately,
some adds to long term costs but still improves health on average,
some actually reduces health on average,
and finally, some less efficient types of preventive screening and less-efficacious procedures can add to cost due to overuse when not well-indicated, suggesting they be used in more narrow ways.