S!
Either the Spit IXLF or the Spit VIII were both used well into 1945 by RAF Squadrons. Both had similar performance. The IXLF was the most common and manufactured in the largest numbers of any Spitfire.
Performance figures for the Spit VIII: (note: +25 lb boost was used in later stages of war, with 150 octane fuel. Rolls Royce found the only difficulty encountered was a quicker burning out of the exhaust stacks, nessesitating replacement more often)
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Tested by Supermarine
Spitfire VIII JF275, Merlin 66, Rated power 1580 HP
Weight 7,770 pounds
Performance test Spitfire VIII
Top Speed (mph)
Height------+18lb boost-----+25 lb boost
--0----------338 MS---------362 MS
2,800--------349------------374*
9,000--------374*-----------387 FS*
12,000-------371FS----------400*
14,000-------380*-----------409*
20,200-------405------------405
*FTH Full Throttle Height
MS Low supercharger
FS High supercharger
Rate of climb ft/min
Height-------+18 lb boost----+25 lb boost
---0----------4,610 MS--------5,580* MS
3,500---------4,610-----------5,050
6,400---------4,610*----------5,080 FS*
11,000--------3,960 FS--------5,100 FS
14,000--------3,990-----------4,600
27,400--------4,010*----------4.010
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Spitfire VIII's flew in Italy, Burma and there was a group active in the Ukraine in the Spring of 1944. If anyone knows the exact Squadrons of that particular Group, I'd appreciate it.