Copy and agree. Sounds like we'll be doing similar stuff. I wish we at least had 93 here. I'll probab;y mix a little unleaded race fuel as well. I'll speak with OST and go from there. Thanks!I don't have a tune yet, so I use 93 on the street; however at the Texas Mile, I use VP MS109 (the organizers sell it at cost at the event)....mix it half and half with 93......I don't think it helps a lot (maybe 1-2 mph), however it doesn't hurt and it acts as a safeguard. At higher temperatures (which it was at this last Texas Mile in October...94 degrees) the PCM would probably have pulled some timing to protect the engine, however with the higher octane there wasn't any issues. In another thread on this Forum (don't remember the exact one) but Mike at OST, highly recommenced mixing unleaded race fuel with pump gas to ensure a high octane, since he has seen issues with pump gas. But other "experts" on this forum claim its a waste of money... since the HCs are tuned for 91 from the factory.....I prefer to be conservative.....I have read more real experts on here recommend it, so that's what I went with. I plan on having multiple tunes, for whatever event I plan on participating in. I don't want to go with E-85, just for the quality issues....I have several friends running it and the fuel varies from E-75 to E-90, so they are always having to check the fuel at fill ups....too much trouble for me.....