Hello timothy,
the bellow links to some Mighty Eighth aces´ Encounter Reports might give you some idea about the ammunition consumption during some of their memorable missions:
http://www.spitfireperformance.com/m...ddy-6aug44.jpg
http://www.spitfireperformance.com/m...er-21nov44.jpg
http://www.spitfireperformance.com/m...on-27nov44.jpg
http://www.spitfireperformance.com/m...er-12oct44.jpg
However please keep in mind that, generally speaking, the breath-taking numbers of multiple kills refer to claims only, i.e. the enemy aircraft need not have been necessarily destroyed and there were some cases of huge overclaiming in virtually all air forces multiple-kill events (the Rudorffer´s and Tangermann´s combat on 6 November 1943 mentioned in the previous post is a classic example of massive overclaiming...).
Hope this helps a little,
Ota