You've got a nice looking jeep!
Does your speedometer indicate your correct speed? This seems kind of simple, but if your speedometer is off so will your mileage for your MPG calculations. Usually the faster you go the more your speed will be off.
Have you tried to adjust your weber? It could just be set too rich or the choke might need to be adjusted.
I know in a jeep, especially topless and doorless, you would have smelled it, but have you physically checked for a fuel leak?
Another thought. When the engine was rebuilt, was it de-stroked, did it get a more aggressive cam, or anything like that?
I still think you should consider posting this up over in the YJ section, there more of the yj guys will see it and someone might have a better solution. You could try posting just a link to this thread. I'm not strong with carbs, so I could be missing something obvious to a carb guy.
Last edited by SquidsYJ; 05-29-2012 at 07:18 AM.
Reason: After thought