Here's an easy test you can perform to see where your problem lies.
Next time you run the tank dry, measure exactly how much gas it takes to fill it back up. If the amount is close to 2.8 gallons, then you're getting very poor gas mileage. Several things can cause poor gas mileage including lower gearing, dragging brakes, oversized jets, bad carb floats.
If the amount of gas to fill the tank is much less than 2.8 gallons, then you might look at things like an obstructed gas tank filler or a faulty petcock.
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