Question about 2007 Nissan Frontier SE Crew Cab

2 Answers

Sudden loss in Fuel Efficiency

I have a new 2007 frontier SE. When I first bought it I used to get 350miles/ tank of fuel, now with only 12500miles on her I am only getting 265miles/ tank of fuel. I was told the fuel efficency would get better as the engine got broke in??? I had it into the dealership and they put it on the computer and nothing showed up. They were no help.
Before I start writing letters of complaints to Nissan and Consumer affairs I would like to get it solved because I love the truck.
I tried a new aif filter and it didn't help, I also tried premium fuel and that didn't make a difference either.
Any help will be greatly appreciated, I am pretty mechanicaly inclined so I am willing to try anything that makes sense.


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  • barnes564 Jun 02, 2009

    If there was a prob with the O2 sensor, would the dealership pick that up when the ran it on the computer?


  • barnes564 Jun 02, 2009

    Also, One more thing..

    Before I noticed the drop in fuel, I put a magnaFlow exhaust systema and a AFE cold air intake on here.

    After 5000miles I changed it back to OEM because I thought the additions were causing me the problem but It stayed the same when I put all the OEM back on.


  • Richard Scordino May 11, 2010

    During the past few years, there has been a lot of "tinkering" going on with the actual composition of what is sold as fuel....Octane is a measure of when a particular fuel will detonate under controlled circumstances, not particularly a measure of how much power it delivers when burned. Simple fact is that gasoline makes far more calories of energy than does alcohol (or just about anything other than nitromethane) An equivalent amount of alcohol makes roughly half the power that gasoline does so you need to burn twice as much of it to do the same amount of work (moving your vehicle) Alcohol has a far higher detonation threshold than does gasoline but modern engines can't take advantage of that without using extremely high compression ratios (10:1 and up) which will cause gasoline to detonate all over the place in it's present form.
    All of this boils down to that the poor quality gasoline we now have, with alcohol added simply cannot give the mpg figures we had from our vehicles even a year ago. (I have seen a mpg loss of about 15% in all the vehicles I have, beginning about one year ago)
    Since timing, and other engine adjustments are all computer controlled, there isn't much one can do to combat the problem (If you eat bad food likely you won't work as well or run as fast either)
    Factory engines do not really require much "break-in" so about one month after you took delivery, your engine was doing all it was ever going to do...after that, everything begins to wear, and become coated with residues that reduce fuel mileage (sensors etc) Although nothing has failed, and will not show up on any machine, it's all beginning to move towards an "out of range" condition. The computer is able to compensate for this up to a certain point but eventually cannot. But, in compensating, most times some performance will suffer.
    Temperature, weather and exactly what you are doing with the vehicle also contributes to mileage. So, unless you are doing the same identical thing every day only under the exact same conditions it will change the mpg you are getting.
    So, what I'm saying is that likely, there is nothing really wrong with your vehicle except that its pretty normal to be seeing the mpg you are getting. Cleaning all the sensors and changing all the injectors once a year would likely make some small difference but is a bit over the top. Building an identical engine but "blueprinting" it to minimum clearances, using better than factory components would also work but again be very expensive.
    Maintain your vehicle regularly and pay attention to details and the mileage will likely remain as it is, And we can all wait for the Obamamobile to be rolled out!!! (A car made from recycled paper with a rubber band that you wind up as you drive, with features such as "smoker alarm", and steering "lock out" that prevents you from turning into the driveway of McDonalds etc" With gps tracking to make sure they know where you are at every moment)

  • Shoaib Rais
    Shoaib Rais May 11, 2010

    there is not much in this car to check bcoz they noirmally are computer controlled like ECU is installed and Fuel efficiency depends on air intakes and sensors installed , if computer doesnt help and have not shown anything then my friend the only thing i can suggest is

    Throttle Body Service

    Air Filter Replacement as u did

    and Spark Plugs replacement check them out for carbon residues and tell me

    otherwise there is nothin much u can do manually with this type of car i would not suggest





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Switch to synthetic oil.
Also, many after market re-tuners claim to improve economy when they also boost performance to the trucks cpu.

Posted on Sep 09, 2009

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Try the o2 sensors that's the only thing i can think of that were your fuel would be going .The o2 sensor has to get to 600 degrees before it will read right they might not be heating up right . That's all i have hope it helps out!!

Posted on Jun 02, 2009


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