Just tested it.
With the governor on, the F.1 Camel with 25% fuel had a max level speed of 109 IAS/114 TAS @ 3K.
With the governor *off* the F.1 Camel with 25% fuel had a max level speed of 109 IAS/114 TAS @ 3K.
With all due respect, I appreciate why the thing exists for playability purposes, but since turning it on represents such a reduction in pilot workload, I think it would be only fair and appropriate if it reduced top level speed performance by a significant amount, say on the order of 5-10%.
Thank you, that is all.