Major Drop in Gas Mileage - Nissan Xterra Forum
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post #1 of 54 Old 12-27-2012, 09:28 AM Thread Starter
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Major Drop in Gas Mileage

I just noticed that I ran a full tank and I only drove 209 miles. I average around 240miles per tank.

I do have an SES light issue which is a Very Small EVAP Leak.

Would this cause the drop in gas mileage?

I haven't had a chance to diagnose the problem. It's either a leak in the hose(s) or a crack in the EVAP canister.

Any thoughts/suggestions?



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post #2 of 54 Old 12-27-2012, 09:35 AM
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I have a similar issue that I was going to post about. Someone told me that I should be getting close to 300 miles on a full tank with an 01, but I don't get anywhere near that. Although I admit, I've been broke and not able to do all the maintenances and such until now.
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post #3 of 54 Old 12-27-2012, 11:38 AM
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i get anywhere between 250 and 300 miles out of a full tank, change your pcv valve its cheap and easy to do and can help alot with mpg and if you have any noticeable power loss it can help that. the investigate your evap leak. try a gas cap lokk at the seal around the cap if it has alot of or any big cracks in it or chunks of seal missing get a new one and it should fix it that seal keeps pressure in tank and can throw a p0441 or other evap leak codes if it goes bad.

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post #4 of 54 Old 12-27-2012, 12:09 PM Thread Starter
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The first thing I did was replace the gas cap. The code I'm getting is 0456 which is classified as a Very Small Leak EVAP. So there's either a hole/crack in the rubber hoses or the EVAP canister.

Never though of the PCV Valve. I'll take a look at it. Thx



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post #5 of 54 Old 12-27-2012, 08:06 PM
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Could it be cold weather and 'winter' gas causing the mpg drop?

just a thought

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post #6 of 54 Old 12-27-2012, 08:23 PM Thread Starter
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Maybe cold weather. I've never noticed such a drop before. I pulled my diagnostics reader. It shows the knock sensor which has existed since I bought the car and 0442 Small Leak EVAP. I would steadily get around 240miles per tank daily driving (city/hwy).
Maybe the fuel filter could need changing. That might be filthy. My tranny also sticks in 3rd gear (winding out at 2700rpms at 60mph). After driving for a few mins it works itself out and drops down to 2500rpms at 65mph.



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post #7 of 54 Old 12-27-2012, 09:44 PM
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Check for lower tire pressures, make sure you don't have a hub that's stuck on, remember you're now running blended (winter) fuel and if you're starting and warming your truck up in the morning, that burns fuel too.

Try cleaning your MAF, if it gets dirty, it will give a worse reading, but not necessarily give a code if it still works within parameters.
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post #8 of 54 Old 12-27-2012, 09:58 PM Thread Starter
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I was thinking about the tire pressure. I do start my car in the morning, but maybe 5-10mins before I leave. I realize that burns fuel, but I never thought that would kill 20-30miles on a full tank.

How would a hub be stuck? I do believe I will need to service the hub bearings soon. It was suggested to me a while ago that its something I should consider.

Noob question... What's the MAF and where is it located?

I'm a mediocre mechanic at best. I do the easy stuff.. Oil changes, brakes, starter/alternator replacement, spark plugs and wires, I did my timing belt with assistance.

Thanks for the suggestions



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post #9 of 54 Old 12-27-2012, 11:57 PM
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maf is mass air flow sensor its the square sensor located in the air intake tube behind the air filter box, be careful cleaning it, use only mass airflow sensor cleaner and dont touch the little things dangling in, only the plastic. could be the winter fuel mix, in texas it doesnt seem to affect vehicles as much but if your elsewhere it might. check out your vacuum leak it maybe causing it, check your fuel filter, that is a cheap way to start to see if it helps. may also run a good fuel treatment such as lucas deep clean or rxp (ask at counter at autozone) (both work good) run that with a new fuel filter. do the pcv valve at same time total parts are about $18 and will maybe take 20 minutes o do total (your pcv valve is located near the n on where it says nissan on the engine in the front most vacuum line running from there. also make sure your not leaking fuel anywhere. let us know if anything helps and keep us up to date and feel free to post up or private message me if you need help.

MY BRIGHT AZZ LIGHTS!

MY STEREO BEATS EM ALL!
My Laundry List
LIFT()
MUD TIRES()
DROP IN K&N FILTER(X)
UPGRADE STEREO(X)
RESTORE BUMPERS(X)
HID AND PIAA FOGS(X)
FIX UP HEADLINER()
WINCH()
MUFFLER UPGRADE()

Last edited by kms1990; 12-28-2012 at 12:00 AM.
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post #10 of 54 Old 12-28-2012, 06:48 AM
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Quote:
Originally Posted by kms1990 View Post
i get anywhere between 250 and 300 miles out of a full tank, change your pcv valve its cheap and easy to do and can help alot with mpg and if you have any noticeable power loss it can help that. the investigate your evap leak. try a gas cap lokk at the seal around the cap if it has alot of or any big cracks in it or chunks of seal missing get a new one and it should fix it that seal keeps pressure in tank and can throw a p0441 or other evap leak codes if it goes bad.
what is the PCV valve? I started following this thread because i've gotten bad MPG since i bought my 04 X in summer of 2011. did knock sensor relocate, put a short ram intake on (helped slightly) but i can't seem to track down why i'm only getting 13.5-15 mpg. i've done the math on like 50 tanks and always fill at same pump. can't figure out what is wrong.
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