QUESTION: Would it be a bad thing to swap from the 91 to 93 tune regularly based upon the shit gas in CA??

We have "76" 100 octane "Race Gas", however, this stuff isn't cheap. So I've been mixing about 70% 91, with the balance of 100 octane. I calculate this to be a sum of approx 94.5 octane, give ...

Billy makes great stuff!! IMO if you're doing ANY bolt ons and that's all you're going to install, HELL yes!

2005 GTO, Custom P&P throttle body, JBA tit/ceram-shorts 3" mandrel bent SS cat-back w/Spin Techs = OMG after only the 91 tune!!!

I can now lite tires at 65 (good scratch), but never came ...

I'm a noob here, but I'll be the first to say that if you've ANY internals, get a dyno tune!! Apparently you have the $$$$$$$$$

6_0_GTO is screwed like anybody that doesn't want to rip "long-eee" headers off a California *F****D stipulation...BFN

Mixed 100 oct "76 race gas" with 91 oct "76 prem gas" for approximately a 50/50 mix - oh crap - this pulls like a raped ape!! I cannot wait to install the "93 octane tune!!!!!!!!!!!"

6_0_GTO

I just installed the 91 tune on my 05 GTO 6spd today. All I have are JBA tit-ceram shorties, custom cat-back with Spin-Techs and a K&N open cone (off road). The TC definetely still works on mine! When I initially took it out and romped on it, of course it accelerated about the same, ECM hadn't ...