Noticing some strange behaviour with maintianning speed - Infiniti Q50 Forum
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post #1 of 11 (permalink) Old 01-11-2017, 03:17 PM Thread Starter
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Default Noticing some strange behaviour with maintianning speed

Hey Guys,

So I have noticed that for the past 4-5 weeks, my car seems to requiring more gas to maintain speed. Even on a straight flat road, I am pressing the accelerator pedal more then I used to which in turn has had an effect on the gas mileage too. Car is about 44k km mark, anyone experienced something similar?

I know its winter and I have winter tires but I don't think those are the cause because when I first got my tires changed, the car was fine for about 3 weeks or so.

Thanks

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post #2 of 11 (permalink) Old 01-11-2017, 05:00 PM
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Alignment? I have noticed in the past that, after an alignment, my car (and previous cars) tend to roll forward with less resistance on the highway. I don't know if that makes any sense or not. For example, cruising down the highway at 70MPH and maintaining that speed seems to take less pedal effort, which to me helps with gas mileage. Also, replace your air filters...
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post #3 of 11 (permalink) Old 01-12-2017, 10:14 AM Thread Starter
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Originally Posted by AllenzQ50S View Post
Alignment? I have noticed in the past that, after an alignment, my car (and previous cars) tend to roll forward with less resistance on the highway. I don't know if that makes any sense or not. For example, cruising down the highway at 70MPH and maintaining that speed seems to take less pedal effort, which to me helps with gas mileage. Also, replace your air filters...
Alignment was done about 3 weeks ago and it was a bit off. I was sure that was it but it doesn't seem to have made a difference also the engine air filters were replaced with the oil change.

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post #4 of 11 (permalink) Old 01-12-2017, 11:10 AM
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Quote:
Originally Posted by Devilzblood View Post
Alignment was done about 3 weeks ago and it was a bit off. I was sure that was it but it doesn't seem to have made a difference also the engine air filters were replaced with the oil change.
Winter fuel blend? I know that I'm seeing a decrease in my fuel economy as a result of the winter fuel blend in the states. Not sure how that works north of the border and if that could possibly be a cause of the issue.

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post #5 of 11 (permalink) Old 01-12-2017, 11:40 AM
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Do you think it has to do with the gas companies using winter blends now? I have heard winter blends are more violate and evaporate more quickly

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post #6 of 11 (permalink) Old 01-12-2017, 12:28 PM Thread Starter
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Originally Posted by Q50SHybridAusTex View Post
Winer fuel blend? I know that I'm seeing a decrease in my fuel economy as a result of the winter fuel blend in the states. Not sure how that works north of the border and if that could possibly be a cause of the issue.
I am not sure if gas companies here have started using winter blends but my other cars seem to be performing just fine. No additional acceleration needed to maintain speed and gas mileage is unchanged. The other two car do take regular gas but are on winter tires as well.

If I had seen the change in the other cars, I would be less worried.

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post #7 of 11 (permalink) Old 01-12-2017, 02:39 PM
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Quote:
Originally Posted by Devilzblood View Post
I am not sure if gas companies here have started using winter blends but my other cars seem to be performing just fine. No additional acceleration needed to maintain speed and gas mileage is unchanged. The other two car do take regular gas but are on winter tires as well.

If I had seen the change in the other cars, I would be less worried.
Not sure about this, but what kind of gas are you using? Do you change the gas up? Try changing it to Shell V-Power (Premium) to see if you notice a difference after a couple of tanks? I found that my Q is most responsive with this particular gas...but it could just be me.
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post #8 of 11 (permalink) Old 01-12-2017, 02:47 PM
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Quote:
Originally Posted by Devilzblood View Post
Alignment was done about 3 weeks ago and it was a bit off. I was sure that was it but it doesn't seem to have made a difference also the engine air filters were replaced with the oil change.
Also, what kind of oil do you use? I am not sure but these things can make a difference a lot of times. My previous car was an '06 Maxima and it would be "sluggish" when the temperature dropped (I usually noticed this around Dec-Feb). In that car I always used Synthetic Oil from day 1, but I eventually switched to a different Full Synthetic Oil (Mobil 1) and noticed that I stopped having those issues. For the Q though, I have only been using the Ester Oil and personally I haven't had issues like this. Try experimenting with changing your oil and/or fuel and see if you notice any difference. You could mention it to the dealer, but they will likely say "it appears normal".
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post #9 of 11 (permalink) Old 01-12-2017, 03:16 PM Thread Starter
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Quote:
Originally Posted by pac_4_ever View Post
Not sure about this, but what kind of gas are you using? Do you change the gas up? Try changing it to Shell V-Power (Premium) to see if you notice a difference after a couple of tanks? I found that my Q is most responsive with this particular gas...but it could just be me.
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Originally Posted by pac_4_ever View Post
Also, what kind of oil do you use? I am not sure but these things can make a difference a lot of times. My previous car was an '06 Maxima and it would be "sluggish" when the temperature dropped (I usually noticed this around Dec-Feb). In that car I always used Synthetic Oil from day 1, but I eventually switched to a different Full Synthetic Oil (Mobil 1) and noticed that I stopped having those issues. For the Q though, I have only been using the Ester Oil and personally I haven't had issues like this. Try experimenting with changing your oil and/or fuel and see if you notice any difference. You could mention it to the dealer, but they will likely say "it appears normal".
Oil is Full Synthetic (Mobil1) done at the Infiniti Dealership.

As for gas I have used 91 and 94 octane from 3 different gas stations 2 fillups each. This hasn't changed though, I bought my car back in Oct 2014 and have been filling up with 91 octane since with the occasional 94 octane fillup. I would have expected this behaviour to happen early if it was something gas related.

I did bring it up when the car went in for the alignment as this was happening prior to that but at that time I thought it was the transmission acting funky. But now I know it is definitely the fact that it needs more acceleration to maintain speed.

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Last edited by Devilzblood; 01-12-2017 at 03:18 PM.
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post #10 of 11 (permalink) Old 01-12-2017, 03:58 PM
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Did they reset your ECU when your car was serviced?
It may be they reset it, and that reset your driving habit the ECU learned.

Any chance Eco Pedal is on?

How is it when you stomp on the pedal to induce wide open throttle?
You need to try WOT to really determine if the engine is being held back.

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