Let me give u a very useful suggestion for mileage improvement in Kia classic. I had this car for 4 years and it drinks petrol. Finally we changed its carburetor with cultus 2003 to 2006 one in good condition.
Return pipe would not be be fitted directly in cultus and rubber pipe will be required. You guys will love mileage... And drive...just get the carburetor which is unrepaired. Cultus had electric choke so that will also work. Original old carby of kia classic is fazool and time wastage. Anyone needs more detail can cal me and remember me in his prayers:) after enjoying better mileage.