Not scientific at all, but mine slowed down almost a tenth and 1 mph when I put some 110 in the tank after running low on pump 93.
11:1 572" hemi at 34° running mid 9s at 140 mph. I didn't adjust anything for the fuel change b/c it's a dedicated pump gas motor.
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
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