im getting only like 17mpg

should i seafoam and hopefully clean some stuff out?
i put half in the gas tank and half in the brake line?

or is it smarter to just do 2 times in the gas tank.

 

Try 1/3rd bottle in the power brake booster VACUUM HOSE (for GOD'S SAKE, DO NOT TRY TO USE IT IN A BRAKE LINE!!!!) and try something else (e.g. BG44K) in the fuel tank. Either way, 17mpg is pretty crappy, and I doubt either of these are the issue.

 

i have the same problem...getting 17-18 with mixed city highway. if seafoam of bg44k doesnt help...what is it..and it certainly isnt my driving style

 

Do the normal: clean your air filter, change the oil, make sure your tires have enough air. If all those have been done, get your car tested. it may be the coils (does it misfire at any RPM) or an emmisions problem. Either one can be tested for free at Autozone.

Oh ya, I got another 2 MPG by just switching over to synthetic oil.

 

ive been getting a consistent 17mpg too on my 2000...before i had no problems but i just went to autozone yesterday and they pull up some ignition coil codes.. i changed my oil,cleaned the air filter, changed the pcv valve, and cleaned teh throttle body before this but nothing changed...so im hoping its the coil

 

if u have intake.. put your stock airbox back on... thats num 1 way to save on gas..
second.. dont go past 3k rpm...
third brakes at a longer distance...
these alone will save you 5-10 gallons

 

explain how braking has anything to do with gas mileage.

 

What I think he means is try to stop and react before the light changes

 

I disagree with putting the stock intake back in. Since I put my InJen in, I've seen about 2 mpg better milage. Allowing more air into the engineer makes it run more effiecently, not worse. Also, there's something else besides driving style causing the low gas milage. I've tried to get my milage down to 15 or so by beating the crap out of my car and had trouble doing it. I've never had problems with my coils, but from the forums and from a little common sense, if one of the coils is bad and not igniting the fuel properly or at all, you're going to see less milage. Another potential problem might be with the exhaust. If there's restrictions (ie a bad cat), the engine will run worse. The only other problem I can think of would be the braking system. If you notice excessive brake dust or noise while the cars driving, the calipers may not be releasing properly (I doubt it, though, as I haven't seen this problem mentioned in the forums yet).

Here's another option: get a 5.5 gen!

 

don't remove your intake, a stock intake restricts flow, and essentially needs more vacuum to make the same power, and the engine dumps fuel as a reference of vacuum and air mass, and because the intake will unrestrict flow, reduce pre-throttleplate vacuum, and change the signal the ecu gets sent from the MAF and MAP sensor(max's have a map, nissan calls it a boost sensor located on your air snorkel) The map sensor is used primarily for diagnostics and provides a limp-home mode for 2k+ maxs in event the maf skips out on you. maintaining that principle of VE, exhaust restrictions can be removed and a similar, and sometimes more pronounced gain in mpg is experienced. An in-tune performance engine is efficient(VE), fuel effiecient, clean burning-less pollution due to a better atomization, more complete burns.

 

i heard aftermarket intake gives you better gas mileage!!!

 

um... aftermarket intake.. more air flow.. more air = more fuel
which is more fuel/air mixture..
more fuel.. less.. mpg..
you guys can think whatever u want..

 

yes more air more fuel, but more air capability, more power, less throttle to go the same speed, don't believe me, get tps monitor.....why do you think my 87 vette has 5.7 litres of thirsty american V8 and gets 27mpg, and my 00 se maxima 5spd gets 27 as well with a mere 3 litres????? and the vette is speed density, so you can't blame it on the fuel map.

 

Well last MOnday I did almost everything
1.- Oil and filter (powerflush!!)
2.- transmition as well
3.- cooland too
4.- new air filter
5.- spark plugs
6.- coils already replaced
7.- tires rotation
8.- cleaned the throttle body

and before I was getting between 22 - 24 mpg half tank.... NOW 18 - 20 mpg driving the same way and everything else......... Help!!!!!!!

 

I went today autozone no ses-light, the guy said no problems????????? If the low MPG can be as matter of fact cold weather???????/ WTF It can be that true???.....help..

 

What is a TPS monitor?
Also what type of MPG gains could one expect fron adding an intake to an otherwise stock 3.5 liter? Showing some improvement in fuel economy would go a long way toward justifying some performance mods with my wife.

 

Look, forget about the intake. Whether it gives you better or worse mileage, it isn't much at all. My intake has been in and out two times each. I have seen ABSOLUTELY NO DIFFERENCE either way. I get 22-23 mpg solid mix city/highway, every tank, regardless of season, weather, etc. The only difference I got up to 26 on a long road trip (all highway) when I took my roof rack off....but I already knew I was losing 2-3 mpg having the rack on...

 

I recently took off my Injen intake and put back the stock intake (due to dealer visit). I decided to leave it on during the raining & winter months. My gas mileage is worse than before after roughly 5K of driving. I average 2-3 mpg less than the aftermarket intake.

With the Injen on, the car is running leaner (more air) therefore giving better gas mileage. However, there are some "slight" pingings at lower speed w/the aftermarket intake.

 

bah...theres no cel...could it still be misfires?
i work with hondas too much, but i get no cel so i jsut assume no random misfirings...
maybe ill look into new coils or sparkplugs

btw, never changed plugs on a v6, any harder? i was told a normal socket wrench probably wouldnt fit all the way down.

 

i got about 20/21 miles in the city/highway on a auto... thats normal right?

 

i get around the same with stock rimmies on, but im due for an oil change so it should hopefully get past 21mpg. how long are our spark plugs good for on the 3.5litre??

 

All you NY/NJ guys don't forget that the winter fuel additives that the EPA requires in your states can also kill your gas mileage...

 

spark plugs should be changed every 30000 miles.

read of manual but there must be people on the org that disagrees.

 

I have not filled up my tank all the way to Full in like a half a year, so for ***** and giggles I tried it 2 days ago, I'm at half tank full right now- filled it up with 17.2 gallons btw- all the way to FULL till it almost overfilled. Anyways half the tank- 268 miles so far. I'm anticipating minimum 420 miles on a tankfull. 100K miles, everything runing like it should, never used any SeaFoam, used a can of BG44K at like 60K miles. Using 93 octane since new, almost always Mobil. Synthetic fluids everywhere but coolant and washer solovant. I drive mostly highway around 80-90MPH, when driving around town I try not to go past 3K RPMs etc. My clutch is on its last legs so beatting it up in 1st and 2nd gear makes no sense, plus my VIAS is broke so taking it up past 5K is pointless. I have a new VIAS, Exedy Racing clutch, STS and wheel bearings to put in next week.

 

Per my owners manual- plugs are at 105K miles. I changed mine at 60 with my coils- just to be sure. I have not had any missfire or power issues- till now with the bad VIAS.

 

I'm not sure if anyone mentioned this but, when driving in NYC your gas milage will suck. I only get an average of 15-18mpg but if i go upstate i get 26-31mpg. Maybe we shouldnt blame our cars so much and just use our location as one of the main reasons this is occuring.

 

i have synthetic oil, new K&N air filter, new ngk plugs, tire pressure is good, and i have driven it at or below 3k rpms one time and no change...the only thing left seems to be fuel filter and that'd be a b!tch to replace. and i do not have any codes either so it isnt the coils. and i run 93 octane all the time. it seems like after reading other similar threads that there are maximas that just can't ever get above 20mpg.

 

yeah man, i never get anything over 21mpg....

 

Hmm... I feel like I just posted on a thread just like this several days ago.... might just be the crack I'm smoking...

Anyways... I got around 18-19 mpg driving around downtown DC mostly and at least 22-24 highway.... RIP is right that road and traffic conditions play a big part in your fuel consumption.... I could be wrong, but I think there are people who for some reason or another, like to do 1/4 mile runs from stop lights and regularly shift at 5k rpms.... that might reduce your mpg a little too... just a little...

Also, the aftermarket intake doesn't really make much of a difference... in my experience, it has helped my mpg go up for whatever the (debatable) reason... the only time it hurt was when I was shifting at 4.5k rpms just to hear the sound of it.... once again, that comes down to how you drive...

And I mostly drive around with a dirty filter and underinflated tires... no kidding...

 

I am pretty sure, most of the low MPG cars just need new MAFs. And 00-01s who do have new ones REALLY do need to have the ECU reprogrammed for the new MAF. I can't stress that enough but my MPG jumped up drastically and car ran much better with the ECU reprograming. I just filled up my gas tank after 431 miles of driving, with 85% of highway driving, and a few 120+MPH bursts of speed, couple of stop light races on a merging lane road etc... I calculated out 27MPG still. Not bad for 100K miles, with about 200lbs of stuff in the trunk- I'm moving to a new job