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In my CRX, I always noticed that I get lower mileage with higher octane. It does kinda makes sense since you have lower BTU per volume due to the extra amount of additives to prevent detonation/pre-ignition. You need more "gas" to burn to reach the same burn rate, keeping everything else constant.
My friends and me included have noticed our cars running rough or missing pretty bad with Arco gas. Main reason why I keep away from Arco stations. Some cars can deal with Arco gas better than others though, if it works for you, go ahead and keep pinching your pennies.
Tip keeping mileage on the high side: Keep out of high-lift, high-duration VTEC region. Same goes for turbo cars... stay out of boost if you wanna sip on gas.
Keep a constant speed... this is very true for AT. When you're going at a constant speed the auto tranny computer will notice and will lock up the torque converter. I'm pretty amaze at mpg rates with modern automatics with the logic they use nowadays coupled with TBW/ETC (throttle by wire, electronic throttle control, whatever you wanna call it).
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