Re: Timing for lower octane?
If your going to use mid grade, why not just go ahead and get premium? think about how much more money it is? it's a dollar and some change per fillup?
Now In a daily commuter, I would use 87 octane, because I could bet the (monthly) savings would be noticeable, other than that, Id stay with midgrade on 14 degrees, as long as you drive easy, I dont think you would detinate.
I have probaly 16 deegrees of timing, and usually run mid grade for short easy trips, when it's 100+ degrees hot out, i try and stay with the 93 octane, at the track I try and buy me a 7$ a gallon 103 vp for peace of mind. 
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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