I would though be a bit carefull with the number 0.1g. It may have read like that in the planes that were used to test this (nowhere is it mentioned to be Spitfires or Hurricanes so it could be any plane that had (which?) Merlin). It does not mean that at the location of the carburator it was 0.1g. And also the acceleration at the carburator in plane x will be different to the acceleration at the carburator in plane y even if the cockpit instruments reads the same acceleration for both planes. This is due to different location of carburator with respect to centre of gravity of the plane.