Ok what's going on? My '85 4wd pickup with 22r gets only 10.5 mpg around town. Runs great, but is original everything with235k mikes. If the carb was sloppy and dumping fuel, it would run crappy, right? If I had a gas leak I'd be smelling gas, and I'm not. Running 30 inch mud tires. 10.5 mpg can't be right! Any insight on this?