Thread: bad gas mileage

so i used to get 22-24mpg in city and about 330+ a full tank. but not im getting about 85-90 in a half tank. all iv done to the car is put a 4"intake on it. and i know i have a p0141 SES which is rear 02 sensor. what else should i look for to fix the guzzling? and no i havnt been racing around town.

I just got mine and I get around 90 to a quarter tank? Is that normal? Fuel computer says 17.2-16.5 per gallon

try replacing the fuel filter... it is a commonly overlooked maintenance item with vehicles that have them. when i bought mine i was getting about the same. come to find out that someone put the fuel filter for an s10 on my car. they look exactly the same, just go on backwards. its amazing how much one of those can make a difference. replacing that o2 will help as well. you can do a search and will find that it has been talked about many times.

yea iv replaced that o2 3 times now and the code never goes away. im about to take it to a shop to have them fix it cuz i cant find anything wrong with it

its a 99

i'm not really sure then, like i said just replace the fuel filter. its a good scapegoat. does the car lack power in any way?.. does it fall flat on its face under hard throttle input?

nope car has balls 100% of the time. and yes all bosch lol. im not spending 180 bucks to buy the oem one from the dealer.

In my case I have no codes at all and defiantly no power loss. I'm no lead foot either. Just was a curious question thats all.

ill look it into it. i never baught anether one. autozone has a year warrnty for them so iv bene switching them out lol. free of charge. and when i get the denso im gonna return the autozone bosch and get my 78 bucks back.

and i also just recently found out yesterday sometimes when driving usually after i take a turn i can smell gas. i havnt found any hoses that are leaking or lose. and the tank is not banged up at all so i dunno. maybe that could be the issue of me only getting 22mpg on highway ?

i had the same problem with my 01 gtp i was getting about 13mpg city. id put new plugs and new front 02 sensor and definitely replace the fuel filter.

maybe its also cuz my car lost 4th gear. i noticed for the first time yesterday but that was the first time iv driving major highway miles recently. so even missing 4th driving on the street might have something to do with the bad mpg.

well city it really should, 4th gear is really only after 40 45 mph, i can see on the highway though.

well even in the city im useally 45-50 if not 55 cuz where i live its alot of back road and **** for cops.

than ya i can understand, i dont know why, but with these cars 4th gear goes, either have it rebuilt or get a new performance tranny