@JPC , is this the new car you just got two months ago from Vintage Motorcars in Phoenix?
If so, I'd take it back to them, tell them you're getting only 10 mpg, and let them take another crack at tuning it.
Your mileage should improve as the engine gets broken in, but, unless you're spending all your time at the drag strip, it should be a lot better than 10 mpg. I think most of us with dual carbs are averaging at least 18-20. And some of us are in the 20-25 range. If I try real hard on a steady highway run, I can eek out 26-27, but it's more usually 20-22.
Another thing to check is how you're measuring your mileage. The trip odometers in a lot of the Chinese replica speedometers don't work or record only intermittently. So, what may read as 80 miles since you last filled up may actually be 160. I think I'd check that first before messing with the carbs if the engine seems to be running OK otherwise.