We run some of the bigger miller air pacs and they do very well but tend to guzzle down fuel. Our older big blues with jack shaft driven compressors wil go 4 days on a tank where the airspace is good for a day and a half or so. If you need lots of air volume, air pacs are great, the newest one we have will even gouge 1/2 carbon, not agressivly, but it will do it. I think it's rated for 7k on the 240 plug as well