I don't know what gas stations are like in the Houston area, but when I lived on the east coast, gas was available in - 87 -89 - 91 -93 (94 for Sun). Now 93-94 is sadly not available on the east coast, 91 is the top. But if 91 is a "middle" grade where you live, perhaps this is what your mechanic OKed. The Box owner's manual states that if 91 is the best you can get, this is just fine and the engine will compensate.
Incidentally, I have heard that 96 grade is available at select 76 stations in the LA area, has anyone found such a station and experimented with this super fuel in their box?
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