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Here is my "what if" scenario.......
Italy had not surrendered and were able to build the Reggiane Re.2005, Fiat G.55, and the Macchi C.205 in great numbers. Air superiority by the allies would have been in question and could have affected troop movement.
the issues that forced italy to fall short were significant than the number and capability of its aircraft. a top notch airforce that is not used correctly will fail to become a game changer...
Italië had big fuel reserves.
Large reserves in 1943?
Do you have a basis for that claim?
Where huge quantities of fuel could be in Italy during 1943 I really don't know.