Given the state of fuel quality nowadays, it's getting much more difficult to predict how a vehicle is going to respond to any given calibration. More stations are running 10% ethanol now and that is having an adverse effect on both performance and economy.
The best I can suggest is to try adjusting timing a little bit to see if it perks things up. Add ½ to 1 degree at a time and see if there's any improvement. If there's nothing by 2 degrees, then put it back to stock. Sometimes, even backing timing down a little seems to help. Each vehicle is different and, like fuel variances, there are many factors that can affect performance.
One other thing you might try is getting gas from a different station and see if that also makes any difference. I've tried several stations in our are and can definitely feel a difference in the way our Expedition runs. Not to mention that I've seen a 1-2 MPG swing depending on which station we buy fuel from.
I hope this helps.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford custom tuning... Since 1996!
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