My 11:1 hemi loses about a tenth and about 1.5 mph on straight VP 110 versus pump 93.
Not very scientific. I ran low on fuel at the track one day and all they had was race fuel, so I threw some 110 in it. Didn't change timing or jetting.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax