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A fuel delivery system for an internal combustion engine including a fuel tank, a membrane dividing the fuel tank into at least a first and second portion, the membrane preferentially diffusing a substance from a mixture, the substance having an increased knock suppression relative to the mixture, a

A fuel delivery system for an internal combustion engine including a fuel tank, a membrane dividing the fuel tank into at least a first and second portion, the membrane preferentially diffusing a substance from a mixture, the substance having an increased knock suppression relative to the mixture, and a controller adjusting delivery of condensed water to the tank responsive to an operating condition.

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The invention claimed is: 1. A fuel delivery system for an internal combustion engine comprising: a fuel tank; a membrane dividing the fuel tank into at least a first and second portion, the membrane preferentially diffusing a substance from a mixture, the substance having an increased knock suppre

The invention claimed is: 1. A fuel delivery system for an internal combustion engine comprising: a fuel tank; a membrane dividing the fuel tank into at least a first and second portion, the membrane preferentially diffusing a substance from a mixture, the substance having an increased knock suppression relative to the mixture; and a controller adjusting delivery of condensed water to the tank responsive to an operating condition. 2. The fuel delivery system of claim 1 wherein the mixture includes gasoline and an alcohol, and where the membrane diffuses alcohol preferentially from gasoline. 3. The fuel delivery system of claim 1 wherein the controller reduces delivery of water responsive to reduced temperature. 4. The fuel delivery system of claim 1 wherein the operating condition includes an amount of water in the second portion of the tank. 5. The fuel delivery system of claim 1 further comprising a battery, the operating condition including a battery state of charge. 6. The fuel delivery system of claim 1 wherein the condensed water is collected from an exhaust of the engine. 7. The fuel delivery system of claim 1 wherein the operating conditions include a fuel tank level of one of the first and second portions. 8. The fuel delivery system of claim 1 wherein the first portion contains the mixture. 9. The fuel delivery system of claim 1 wherein the condensed water is gathered from an air conditioning system, and where the controller adjusts operation of the air conditioning system to adjust delivery of the condensed water. 10. The fuel delivery system of claim 1, wherein the controller further adjusts delivery of condensed water by adjusting a pump. 11. The fuel delivery system of claim 1, wherein the controller further adjusts delivery of condensed water by adjusting a flow of air over a condenser. 12. A fuel delivery system for an internal combustion engine comprising: a fuel tank; a membrane dividing the fuel tank into a first portion enclosing a blended fuel mixture and a second portion, the blended fuel mixture including gasoline and ethanol; a first injector configured to receive fuel from the first portion of the fuel tank; a second injector configured to receive fuel from the second portion of the fuel tank; and a controller configured to adjust the amount of condensed water in the second portion of the fuel tank in response to an operating condition. 13. The fuel delivery system of claim 12 wherein the operating condition includes an ambient temperature. 14. The fuel delivery system of claim 12 wherein the operating condition includes a concentration of water in the second portion. 15. The fuel delivery system of claim 12 wherein the operating condition includes a battery condition. 16. The fuel delivery system of claim 12 wherein the first injector is configured to provide port fuel injection and the second injector is configured to provide direct fuel injection. 17. The fuel delivery system of claim 12 wherein the membrane is flexible, the membrane configured to flex and passively adjust a volume of the first or second portions of the fuel tank. 18. A fuel delivery system in an internal combustion engine of a vehicle, comprising: a fuel tank; a battery; a flexible membrane dividing the fuel tank into at least a first and second portion; a port injector coupled to the first portion; a direct injector coupled to the second portion; a water condensate system coupled to the second portion, the water condensate system including an electrically driven actuator configured to adjust delivery of water condensate to the second portion of the fuel tank; and a controller configured to adjust the actuator in response to an engine temperature and concentration of water in the second portion of the fuel tank. 19. The fuel delivery system of claim 18 wherein the actuator is a pump coupled to a condenser included in the water condensate system. 20. The fuel delivery system of claim 18 wherein the actuator is a fan configured to direct air over a condenser included in the water condensate system. 21. The fuel delivery system of claim 18 wherein the control further adjusts the actuator in response to a fuel level and a state of charge of the battery.