Help!! Very poor mpg - Page 2 - Nissan Xterra Forum
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#11 Old 02-13-2013, 06:19 PM
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Quote:
Originally Posted by Gsimpson2G View Post
try disconnecting the battery for a little bit to clear that code out. Drive around for awhile, and see what your MPG are then, and check after a bit of driving and see if the code is back,
Disconnecting battery for a while clars codes?

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#12 Old 02-13-2013, 07:29 PM
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the knock sensor doesn't trigger the engine light must have another code in the system
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#13 Old 02-13-2013, 07:41 PM
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Yeah the knock sensor is not tripping your CEL... there's another code. If it's an O2 sensor or something like that it could be affecting your mileage. I'm lifted 4", steel bumpers, 33s and I am getting 15.5 mpgs around town and much better on the highway at reasonable speed.

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#14 Old 02-13-2013, 08:11 PM
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Quote:
Originally Posted by xtacular View Post
Yeah the knock sensor is not tripping your CEL... there's another code. If it's an O2 sensor or something like that it could be affecting your mileage. I'm lifted 4", steel bumpers, 33s and I am getting 15.5 mpgs around town and much better on the highway at reasonable speed.
Likewise: ~5" lift, 33x12.5 tires and armored and I get 13-15mpg city driving.

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#15 Old 02-13-2013, 09:53 PM
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stock 2000 3.3l with 156000 miles on er highway tread tires 265/70/15s recent minor tune up (new plugs wires and fuel filter and distributor, due to failure not for tune up, and k&n drop in filter)

and fresh fluids (do not flush the tranny unless you know its been done before or the fluid isnt too dark as doing it after too long on old fluid could mess it up a drain and fill with new tranny filter would be more beneficial

i ran pennzoil hm oil 10w30 because a few leaks i had (recently fixed and changed to castrol gtx syn blend 5w30 and noticed a better response and seems like a lil bump in fuel economy, would use full synthetic but dont have the $)

new shocks and accessory belts done, service records show 105k mile tune up done at 117k so i think my timing belt was done and battery

i get about 15.5-17mpg average (depending on how much highway i drive that tank) but even before i did anything to it when i got it a year ago i was getting 14.8-16.7 (depending on highway driving amount) and one tank when i filled at half i got 21mpg best since was 18.4 on a 50% hwy 50% city and usual is between 15.5 and 17.2ish best thing i can recommend you do for this is REPLACE THE FUEL FILTER AND PCV VALVE! that plays a major role in our trucks mpg and power and dump a bottle of regular lucas (clear bottle brown liquid in it when you do that) may also try the diy seafoam in the diy section i used the brake booster vacuum line, here is a link:http://www.clubxterra.org/forums/showthread.php?t=18963

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Last edited by kms1990; 02-13-2013 at 10:02 PM.
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