Just did some more testing, 1000ft with boost, 50% rads and 2500 revs when appropriate
Spit 1 250mph
Spit 1a 265mph
Spit 1a 100oct 290mph
Spit 11a 280mph
Hurri DH5-20 262mph
Hurri mk1 100oct 274mph
Hurri Rotol 258mph
conclusion :- 100 octane give superior performance at low altitude
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