I have found that what it say it will run on and what it actually needs are not the same, I would say around 5 cfm @ 90 for best results for an impact. If you have a tank with the compressor You should be able to use it in short bursts, I did this with a little pancake compressor when pulling a motor out of my MG.
The compressor in my garage does 5.8cfm @90 and just barely keeps up with my impact gun set to full torque.
If your only going to need to fill tires that compressor should work, Then you could also test how well it keeps up with a gun set to a lower torque say just enough to lossen lug nuts.
Mines an older Blue Point.