fuel ?
Whatever they've got at the tracks you plan on racing at.... Whether it'd be sunoco 100 or something similar... But if you go that route, might as well take advantage and up the boost...
I've run a mix of 104 and 93 for a while now, and I've had no problems. If you're not going to be able to adjust the flash for track and street use, I'd just tune it for the best stuff you can keep in your car all the time.
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I'm not saying they won't handle it, but I've run race gas in many unmodified cars (including the Evo, although not pure race gas) and haven't ever had any problems. Some have had pure race, some not...but I'd be curious as to why they can't (or at least the philosophy as to why you believe they can't.) Hopefully I'm not coming across as a jerk, as I would like to know (I always like to learn something new.)
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I don't think he knows. He is probably posting something he heard somewhere.
There was an old thread on here some time back about Mitsu voiding warranty on some injectors because of using leaded race gas. According to mitsu race gas leaves some residue that can clog the injectors. Mitsu put out a bulletin to their techs on how to identify if race gas was used(pinkish residue) Of course this is all hearsay.
Sounds like cheap race gas that uses I think what is called MMTs. Use something good like C16 and you won't have to worry about that. Just use something that doesn't use MMT to raise the octane. 