I agree that a 60 gallon should be adequate. I have been through 2 30 gallon compressors, a 60 gallon, and a 90 gallon. The 60 and the 90 performed great with impact tools, blowers, and paint guns at moderate use. The 90 was the only one to cut it at heavy (very heavy) use. The 30 gallon will run tools fine in small bursts. It falls on its face if you use something like a die grinder or rotary cutter though. Of course this is all my personal opinion based on my experience.