Gas Mileage on a 98 Maxima

[skids929]

Originally Posted by JeEvE

My mileage on my 98 5spd is terrible. I think im gettin under 200 a tank. I was able to get the two front o2 sensors off ebay for $120. I hope thats the problem, I already changed oil, air filter, fuel filter, plugs and used BG 44k fuel cleaner, cleaned the TB and cleaned some of the carbon out with sea foam.

Sounds like you are going through what I am going through. Tell me something, when do you plan in putting in the new o2 sensors? Can you let me know if it makes a difference for you? Are they setting off the check engine light? I think we have the same problem, lets try and whip this thing!

[JeEvE]

I want to do it as soon as possible but its really cold out, it just snowed and now its all slushy. Im not sure when Ill have a chance to put them in. I have no engine check light so maybe the sensors are close to going.

[skids929]

Originally Posted by JeEvE

I want to do it as soon as possible but its really cold out, it just snowed and now its all slushy. Im not sure when Ill have a chance to put them in. I have no engine check light so maybe the sensors are close to going.

I was thinking the same thing..I don't think the check engine light always has to be on for them to necessarily be bad. Where I am it is snowing as well so I understand. Be sure to let me know when you change them and how it worked for you.

[skids929]

I did the math today after a fill up, to get the MPG I am currently getting.

I went 228 miles on 15.8 gallons of gas; that is 14.4 MPG. This a vehicle that is supposed to get at least 20 MPG on a bad day. After doing this calculation I now KNOW for a fact there is a major issue with my gas consumption.

I had about an 1/8 of a tank left when I filled up today, the 228 miles was from a full tank of 93. I am guessing I would have got about 250 miles before it was too empty. 250 miles for an 18 gallon tank is really low. I have spoke with many people who say their 4th generation Maxima's get closer to 400 miles per fill up.

[Spaz]

Yeah, 400 miles per fill up was what I was saying earlier.

Perhaps it's a throttle position sensor issue, like i've been having. I've noticed a bit of a fuel drop since that's started to go. Have you checked that?