Abstract: An adaptive fuel control system and method directed for use in a motor vehicle powered by a fuel-injected engine and having a fuel tank and a fuel rail and which is operative to run on a plurality of fuels and fuel blends. The system includes a refueling mixer which acts as a fluid damper to slowly introduce new fuel into the fuel rail and correspondingly slow the rate at which new fuel composition is mixed with existing fuel. A stratification mixer is also utilized to re-mix components of blended fuels which may have separated at cold temperatures. An Exhaust Gas Oxygen sensor (EGO) monitors engine exhaust gases and generates a corresponding electrical signal when the air/fuel mixture of the fuel switches between rich and lean. Finally, an electronic control assembly communicates with the EGO and the fuel injectors to generate and store in memory an updatable extended adaptive fuel control table of air/fuel ratio multipliers for selected engine load/engine speed cells.