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What is your normal cruising speed?
I have a +1 countershaft sprocket on my SVn, and it does help smooth out the cruise. Biggest factor for mileage though, is your cruising speed - the faster you go the lower the mileage. After 45 mph it's all downhill from there...
Keeping the revs lower does help, but cruising at 60 instead of 70 makes more of a difference than a gearing change will. Once you get close to 80 it's not very good at all, especially with my naked SV.
If you cruise in the 60 to 70 range, going with +1 on the countershaft may be an improvement, but +2 may put you too far down in the rev range/torque curve for best efficiency in top gear.
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