This engine has less than 82K miles on it, has been tune-up with new filters and ignition parts. It is totally stock, except for the disabled air injection system. All vacuum lines are properly connected and the engine does not smoke. I have not measured the exact gas mileage but have notice the gas gauge moving a bit faster than I think it should. I had a vehicle with a 22R carbureted engine before so I have some experience with these. I have read that certain carburetor parts will fail and allow excess fuel to flow into the intake. Can anyone confirm this and provide more details about these parts? Thanks.