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Q: car consuming so much gas,whats the problem? on 1998 Nissan Altima

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the sparkplugs and ignition cord as well as the fuel filter were replaced but still the engine consumes more gasoline.
(1) Answer
Could be a stuck open thermostat, faulty coolant temperature sensor - these problems won't let the ECM to switch to closed loop mode, bad O2 sensor, wrong spark plugs, intake leak, bad fuel injectors, engine mechanical fault - low compression, etc....
I'd take the car to a good repair shop and let them to check it since so many different thing could cause this condition.

Zee