I did a driveway test with my 2 pumps about a month ago. Aired 2 of my 35s down to 15 psi and aired them back up to 32 psi. My MF-1050 pump (2.3 cfm) did it in 4:21. My Smittbilt (5.5 cfm) did it in 3:23. This was in Denver at an elevation of 5500 feet. this was only 1 tire for each pump. I know the MF-1050 slows way down when it gets hot. I’ll be curious to hear how yours performs.