Is there a fuel reset button on Dodge Nitro?

No, there is no fuel reset button on a Dodge Nitro (or most modern vehicles) in the way some older cars had a fuel economy trip meter reset. The average fuel economy is calculated automatically by the vehicle's computer system based on fuel consumption and mileage. You can usually reset the *average fuel economy display* through the vehicle's instrument cluster menu (often accessed via buttons on the steering wheel). This resets the *displayed* average, not the fuel system itself.