I too am at the point to where I am trying to tune for the best mileage (pretty much like the rest of my tune). So if I follow this discussion correctly, best mileage is done by increasing main to around 8* (which I have done) and decreasing pilot to around 10*? This will drastically decrease dwell time over stock as the pilot is at over 20* (IIRC). Outside of the cruising range, the pilot is significantly retarded and pilot advanced, increasing dwell time significantly. What are the advantages and disadvantages of changing the dwell time and pilot mm3?