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My Virago 700 can go about 80 mph on 400mm^2 of throttle opening, that is a 20 mm carb. My carb has a 34mm throat. It is a Vm34 mikuni mechanical slide carb that I adapted using a manifold. I have been using it for about 3 years not the pair of vacuum carbs that were factory. It gets 50 mpg two up at 65 mph.
Mikuni slide carbs are nice because you can get all the jetting easily.
If I were looking for maximum economy I would consider using a single or twin 20mm carbs on fairly long intake manifolds. Having a longer intake tract might have a better torque at cruising rpm rather than at near maximum.
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