The older Newells, like my '82 Classic, hold their air pretty well, but based on my conversations with others who have the newer, higher tech Newells, 20 psi in 40 minutes doesn't sound too bad. It the average day time temps in my area stay above 60 I may lose 20 psi in a week. If it gets below 50 for long periods of time then I may lose 20 psi in a couple of days.
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