hey al , so now i found a gas station that sells race gas and a local auto shop told me it's 100 octane, i use 91 regularly in CA, so if i always use half half daily which roughly = 95 octane, then if i leave my boost at 21 taper down to 19? cuz the flash is done with 91 oct mapping..
doing this i hope it would be more reliable since everyone suggest not to boost 21psi with 91 oct.
another issue is that i don't always mixed right, so if always mixed resulting different amount of oct range from 91-96 oct, would that be ok? would it do harm to the engine? PLEASE ADVICE!!!!!!!!!!!!!!!!!!!!!!!!!!!!! THANKS!!!!!!!!!!!!!!!!

I'd errr on the side of caution and go with 94 as a 50/50, more if you heavy on the 100.

Here's how to calculate octane levels by mixing different types of gasses. I personally run 22PSI on 93 octane.
http://www.motorsportsracingfuels.co...alculator.html

thanks guys, so there's no harm for doing this right?? cuz the highest pump gas is 91 and there just one location near my work place has 100 oct, lucky. so gotta get some 100 right.
so less 100 and more 91 is the answer right? i used the oct calculator using the above link and said 4 gallon of 100 and 8 gallon of 91 will = 94 oct.
so doing this can let me stay at 21 psi and no harm to engine, any YESES?????!!

It depends on how your car is tuned. Sounds like Al would be the one to ask since i don't know much about dynoflash.

yeh, AL you are the master of tuning, is my octane mixing plan ok?????????

Where is the Gas Station where you buy your 100octane... and is it Vp Fuels? There is a Station like 30mins from me that sells VP 100octane and it 5.99Gallon.

yeh 76 gas station vp race gas, an owner of a local motorsport shop told me it's 100 oct