Greg, stop listening to Kurfurst. The only K-4s that could compete with the Spit XIV was those that had MW50. This wasn't authorized til late March '45 and is questionable if methanol was readily available at that time.
The MW50 system in the Bf 109 G became fitted and retrofitted from early May '44 onwards, after development and testing from late '43 onwards in the DB 605 A and the DB 605 AS.
The delivery of the Bf 109 K-4 seems to have begun in Oct '44 and the engine was the DB 605 DM with MW50. In late '44 the main production DB 605 D engines for the Bf 109 K-4 became the DB 605 DB and DC versions, all with MW50.
Where Methanol was in short supply, MW30 was used or Ethanol as EW50.