99BoomFinder Posted February 19, 2008 Share Posted February 19, 2008 I have a 1999 (not the 99.5) Pathfinder that gets about 11mpg city and 16mpg hwy. I don't think this is normal. Does anyone have any reccomendations as to what I should check out? Any information related to this would be VERY helpful. Thanks! Link to comment Share on other sites More sharing options...
laxman0324 Posted February 19, 2008 Share Posted February 19, 2008 Do you notice anything else with the truck? Any CEL or high idle or rough idle? Go scan your codes, sometimes you will have existing codes but no CEL. Link to comment Share on other sites More sharing options...
99BoomFinder Posted February 19, 2008 Author Share Posted February 19, 2008 Do you notice anything else with the truck? Any CEL or high idle or rough idle? Go scan your codes, sometimes you will have existing codes but no CEL. Not too much out of the norm. I will scan for codes....I don't have a CEL, and didn't think about doing that. Link to comment Share on other sites More sharing options...
FUELER Posted February 19, 2008 Share Posted February 19, 2008 i get similar #'s..... usually between 12 and 15 mpg Link to comment Share on other sites More sharing options...
99BoomFinder Posted February 19, 2008 Author Share Posted February 19, 2008 i get similar #'s..... usually between 12 and 15 mpg Yeah...I rounded a little. It was like 15.6hwy, but I figured it was easier to just say 16hwy Link to comment Share on other sites More sharing options...
csutke Posted February 19, 2008 Share Posted February 19, 2008 those sound about right Link to comment Share on other sites More sharing options...
laxman0324 Posted February 20, 2008 Share Posted February 20, 2008 Im getting about 19 on the highway...hoping for 20 with new plugs and SRI...it all depends on your driving style too. I baby mine, cruise control at 5 over the speed limit on any highway and not a lot of city driving Link to comment Share on other sites More sharing options...
99BoomFinder Posted February 20, 2008 Author Share Posted February 20, 2008 I scaned my Pathy for codes, and nothing turned up. Any reccomendations? I am pretty sure the MAF sensor is clean, but I will double check. Link to comment Share on other sites More sharing options...
BowTied Posted February 21, 2008 Share Posted February 21, 2008 I scaned my Pathy for codes, and nothing turned up. Any reccomendations? I am pretty sure the MAF sensor is clean, but I will double check. Assuming the truck has had a relatively recent tune-up.... and it is getting up to full operating temperature, I would consider a new O2 sensors and/or new coolant temp sensor if they are original. If you have access to a higher end scanner, you can watch the response of the O2 sensors go from lean to rich. If one is lazy hanging on the rich side too much, that could be the culprit.... Link to comment Share on other sites More sharing options...
HankG Posted February 21, 2008 Share Posted February 21, 2008 I've been trying to improve my mileage as well since I got the Pathfinder in December without much luck. Between what the previous owner did, what I did for smog purposes, and what I did after reading an earlier thread on mileage, the pathfinder has gotten a full tuneup, all four new o2 sensors, a new coolant temp sensor (that one helped a little since the old one was completely wrecked), clean MAF sensor, and Warn manual hubs. Also, it should be a bit below stock weight and has 225/15 AT tires (for now anyways). Despite all this, I get 16 mpg mostly highway even when doing low rpm shifts and keeping it under 65. I'm not really sure what else there is to fix; was hoping to get the highway mpg up to around 20 before adding things that would bring it back down. Link to comment Share on other sites More sharing options...
laxman0324 Posted February 21, 2008 Share Posted February 21, 2008 All I have done so far is replace one O2 sensor and put on Mille Marker hubs (like warns but cheaper), and my truck has 3 radials and 1 Uniroyal Liberator AT (from previous owner). I always keep them at 50 PSI since they are 30x9.50, and I get around 19.5 with cruise between 60 and 70 and a light foot. I have no idea what the previous owner did but I will be doing a full tune up this summer. Maybe its my busted up front bumper giving me good aerodynamics Also you need to consider how much ethanol the pumps in your area run, that can kill mileage. If most members are getting 16-17 on the highway i would say im abnormal, so dont expect to get what i get Link to comment Share on other sites More sharing options...
BowTied Posted February 21, 2008 Share Posted February 21, 2008 (edited) Also, if you live in the north, they put additives in the fuel during the winter. THis winter gas (with deicers and what not) hurts fuel economy by as much as 3 mpg I have heard on other forums. Better to test you mileage in June/July. Edited February 21, 2008 by BowTied Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now