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Guy,
The absolute temps for EGT's are actually not very important. Among other things, a difference in probe placement introduces some variations.
What matters is where they are relative to peak. In an ideal world (or with the aid of GAMIs), all EGTs would peak at nearly the same fuel flow. If the spread is too wide, it means some cylinders are much richer than others. Let's say you want to run 125 dROP, then your leanest cylinder (the one that peaks first) should be set to that temp. This means that your richest cylinder might be 225 dROP - which is clearly just wasting gas - perhaps to the tune of 1 to 3 gallons per hour.
If you wanted to run LOP, a wide EGT peak spread would imply that's not possible. A cylinder's not going to run much leaner than 100 dLOP. So if your target was 50 dLOP (for the richest cylinder), that means the leanest would be at 150 dLOP - and would not be producing power. LOP operation requires all cylinders to peak at nearly the same fuel flow. So if you set you’re your power such that the richest cylinder was 50 dLOP, then the leanest might be 80 dLOP. All othes would be between those numbers.
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