Found in a book on the Dewoitine D.520 (Docavia)...On the 21st April (1940), D.520 No. 2, using 100 octane rated fuel, and with a CEMA pilot at the controls...p.303.
Table of Characteristics of Hispano-Suiza 12Y series engines
12Y-45
Series production D.520 No.s 1-350
Rated for 92 or 100 Octane fuel
12Y-49
Late series D.520 No.s 351- also rated for 92 or 100 Octane fuel p.245.
Also Mushroom Yellow series No 6113 p.38
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