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Third I have been using mid grade and premium grade gas as I truly run my AC constantly here in Houston and the performance and mileage suffers immensely if I run regular. I have wondered if there is an additive that might be an acceptable substitute for this though.
The majority of fuel additives are nothing more than fuel system cleaners, they do nothing to improve the octane rating. I looked at some quality octane booster once, it was over $8 a bottle and from my research would only improve octane 1 point or less. Much cheaper to just buy higher octane fuel.
 
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