I've heard this and I've seen many people who subscribe to this in their tuning. Also is there calculations and tables that aren't visible in hptuners that affect timing? I have seen timing pulled in my datalogs and don't see anything in any of the tables that would cause it.
in sd it uses the low octane table.
as for the timing being pulled, check you iat adders, and burst knock tables.
2006 cobalt (no more turbo)
m62 2.7 pulley, E85, 79lb/hr injectors, 4-2-1 longtube header, airbox mod, stock catback
1998 Trans am 5.3 iron block 317 heads 88mm turbo e85 105lb/hr injectors, twin 255's.... build in progress
2014 wrx mild tune 18psi pump gas
thanks
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