Kim YB, Chang YJ, Jung WS, Byen SH, Jo YY. J Anesth. 2013 Dec;27(6):827-31
After placement of an i-gel device in 40 patients, 20 were ventilated without PEEP while the other half received 5cmH20. Incidences of significent leaks and leak volumes were similar in both groups.
Link to abstract