I had the carburetor rebuilt, however am only getting 16 mpg expecting at least 20 mpg. I have properly adjusted the choke, so that the motor will keep running at a fast idle until the car motor heats up and you hit the acellarator to return to a normal idle speed. The two gas mixture screws and the gas idle screws are a bit more complicated. I have got the gas mixture set to prevent stalling when the motor is idling, however the motor is not running smooth. I watch the oil pressure gauge (maximun reading is 45) and try to keep the gauge on 27-30 when idling and the motor is hot. Any tips on how to make the carburator perform better would be appreciated!!