Will changing spark plugs and wires increase mpg on 04 Nissan Titan v8?

Yes, changing spark plugs and wires can potentially increase fuel efficiency in a 2004 Nissan Titan V8. Worn or faulty spark plugs and wires can lead to incomplete combustion, resulting in lower gas mileage. New spark plugs can improve ignition efficiency, while new wires ensure proper spark delivery, potentially enhancing overall engine performance and fuel economy. However, the improvement may vary based on the overall condition of the vehicle and other factors affecting fuel efficiency.