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Remember, model A gas mileage and speed stories are similar to fish stories, Trust but Verify. However 10 mpg seems somewhat low. Don't pay attention to where others have their GAV, it varies greatly per car, especially since you have a different carb. Set the GAV for smooth running and best power. Run the car around 45 mph for a tank, in reasonably level terrain and then check the mileage. Don't set the GAV any leaner than what runs the best. Advance the spark until it just starts to ping on acceleration, then back off a click or so. If you havent tuned your ear to what ping sounds like you can go to youtube and hear it in videos. Some people with enough hearing loss can't detect it. Take a young person with who can hear well, teach them what to listen to. If it still doesn't give you the mileage you're looking for then swap out the carb with one from a tested car. Let us know how it goes.