You may need to adjust your AFC housing. Besides the preload, (jambnut on top) you could also crank the star wheel up a little to add more spring pressure on the diaphram. This would make the injection pump need more boost before the pin is pushed down and more fuel is injected. Also, increasing injection timing will increase smoke at your peak torque, but that doesn't always mean it in efficient. Most times, increasing timing results in better mileage. Have you tested your mileage since advancing the timing? That will tell you if your really sending much unburt fuel out the tail pipe.
Jason
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