Having said that, the P-47 credit (air) to All Losses - ALL Ops ranged from 4:1 for 56th to 2:1 for 353rd to 1.5:1 for 356th FG. For All ops the Mustang groups were as follows for dominantly Mustang group ops: 4th 2:1, 339th 2.5:1, 357th 4;1, 352nd 4;1, 355th 2.2;1, for the P-38 groups 20th 3:1, 55th 4:3, 364th 2:1, 479th 1.5:1.
For the Mustang Groups, the difference in air to air versus air credits to all losses are that the lower ratio'd groups had high ground credits (and losses to flak)