Question about 2007 Infiniti I35

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2003 Infiniti i35 mpg

Hello. I have a 2003 Infiniti i35. 26,000 miles. When i bought the car in July of 2006 a Full tank of Gas used to give me about 300 miles. However, today, for example, the needle was almost on empty but i only got 228 miles for a FULL tank of gas which ends up being about 16 mpg in the city (i used to get around 24 in the city the first month or so). What is wrong? The car is in MINT condition and i cant find anything wrong with it. There is no warranty on the car so everything i do has to come from my pocket. I've read reviews on people with the same car and the same year who are getting around 24-26 MPG. Please help. I need serious answers. Additional Details - i live in california. normal weather. no snow or anything. i actually HAD the A/C on in july and through august and sept when i got my mpg of 24ish. Now, i dont. I dont even turn the heater on. And yes, i know how to to compare things: same conditions, etc. I am driving the same exact way i was in july and august when i got a mpg of 24, but its 16. wwhat you think is going on?

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  • emoran002 Feb 14, 2009

    I have a 2003. Same exact thing is happening to me. Must be a common problem. Somebody help!


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There are so many things that can cause this. What you really need is access to a real scanner, not a code reader, and look at the live data. Look at fuel trim and see what it is doing. If it is taking fuel away, there is something causing an over-fueling condition. If it is adding fuel, then you are actually driving a little lean, but compensating for it by adding fuel with the accelerator, causing loss of fuel economy. Looking at the fuel trim, along with the actual data readings for the MAF, Oxygen sensor(s) and other variables you can have a better idea of what is going on under the hood. Unfortunately, these things are more and more requiring electronic monitoring for diagnostics, unlike years past when we could just about overhaul the car with a screwdriver, a couple of wrenches, a hammer and a pair of pliers. Happy motoring

Posted on May 18, 2008

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