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Old 09-23-2018, 04:46 AM   #1
poikaa
 
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Default Lousy gas mileage

I have a 2001 Nissan Frontier with the four cylinder engine Does well on the interstate but terrible on local highways and streets. Seems to be running just fine and I use synthetic oils. I have used Sea Foam in the gas, this seems to help performance but not the gas mileage.

I am guessing around town I am achieving about 10 MPG or thereabouts . Injectors? Plugs?

P.S. My 1999 Frontier was great on gas! as well as all of my Hardbodies.....

TIA poikaa

Last edited by poikaa; 09-23-2018 at 04:49 AM. Reason: more
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Old 09-23-2018, 11:15 AM   #2
cadillacdude1975
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Welcome to IN. I am not too familiar with the newer models, but the plugs would be a good place to start. It won’t hurt to change the fuel filter and probably the coolant sensor. On the older trucks, a bad coolant sensor will affect the fuel mix, so I imagine this would be the same with the newer ones with the far more advanced computer system.
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Old 09-23-2018, 05:20 PM   #3
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Welcome to Infamous.


Have the O2 sensors been replaced?
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