My car gets very bad gas milage. I fill the tank up and if i drive it to empty I onhly get about 130 to 150 miles out of it. I have a 350 tpi all stock. Do you think replacing my O2 sensor would help or do you have any other suggestions on what might be causing this low milage, and no I am not spinning my tires at every stop sign and blowing donuts every where, just casual country driving.
Jason

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1988 Pontiac GTA
Loaded
350 700R4

 

Is your exhaust smell funny, and is there alot more carbon collecting around the tail pipes?? Cause if it is I had the same problem, one of the vaccuum hoses broke on my MAP sensor.

 

check vacuum lines, i dunno if the O2 will affect it that badly..but they do wear out, and id say if you have over 40K miles it would do you good to change it anyway. also check your base timing, if its retarted you'll get crap mileage

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350, Comp 262, Edelbrock Performer intake 600 cfm carb and exhaust, headers

 

also check the timing