All stock engine - 327 gears and X pipe - after trying many brands and many octanes from 93 to 87 , car seems to idle better , more responsive and has better power running on 87 .
When you say “ better grades of premium gas have fuel additives “ are you saying the 87 gas has no cleaning additives in them ? I also heard the generic companies just buy gas from the major refinery companies - I also heard that all gas starts as 87 and they add the octane additive to cause it to be less volatile and bring octane ratings to 93 . Another aspect is that all octane grades share the same hose at the pump , meaning if guy who bought 87 before you then you get about a good bit of the 87 that is sitting in hose . Btw , I am not really that OCD about this topic , just simply chatting on subject - who really know what’s in those mystery underground tanks at the pump , lol .
I worked in a truck loadout facility in SoCal years back and every brand in the area loaded at the same facility. They just added their specific additives at the rack. I currently work at a refinery with their own loadout that does the same thing. Their is one set of stations in the area that don't, but they have their own refineries. So for the most part, all gas at the pump is the same, just with brand specific additives.When you say “ better grades of premium gas have fuel additives “ are you saying the 87 gas has no cleaning additives in them ? I also heard the generic companies just buy gas from the major refinery companies