2019 qx50 mpg - Page 2 - Infiniti QX50 Forum
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post #11 of 24 Old 03-14-2019, 07:45 PM
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Ummm, Twam911....well, where to start. Of course you have to use premium gas as recommended for the vehicle, driving the speed limit is irrelevant to mileage although driving at slow speeds (local or highway speed) gets better mileage than driving at higher speeds, and well, I'm not sure what an "engine brake" is if not the brake pedal, but I imaging it is a good idea to not have it on when driving.












And yes, Eco mode should give better mileage at any speed (above or below 50, I think) as it is intended to do, but at a sacrifice in performance. In any case, as I reported above, I get around 21 locally and high twenties or more on the highways IF I drive conservatively and am on flat roads. Anything else hits my mileage numbers....fast acceleration, going up hills, using sport mode.
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post #12 of 24 Old 03-18-2019, 06:53 PM
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I bought the QX50 about a month ago and took my first highway trip this past weekend and I am greatly disappointed in the mpg. I drove about 230 miles of which 90% of the trip was highway and I only got 23mpg with an average speed of 75mph. I had the tranny is standard mode the whole time. I don't even want to talk about the worthless ECO mode.



Guys, do we have an issue here? Are we being sold smoke and mirrors?
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post #13 of 24 Old 03-22-2019, 09:21 PM
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It is double smoke as you can’t get the promised mpg on your vehicle display and you get even worst when you do actual math at the pump. I think it’s how Infiniti works. Same thing on my QX60. I had Audi and I was getting better mpg than estimated.

Last edited by Grisho69; 03-22-2019 at 09:24 PM.
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post #14 of 24 Old 03-27-2019, 07:34 PM
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I get around 20 mpg per my tracking on Fuelly, about 60/40 city/hwy. So far off of the EPA estimates - considerably more off than any other vehicle I've owned. What's worse is the tiny 16 gallon gas tank, which makes it feel like I'm filling up constantly. I don't drive many miles, about 1k/month.

Consumer Reports had an article a couple months back about how the 2019 QX50 was a severe outlier in the EPA vs. real world discrepancy.

From the article:
"That’s why it’s so striking to have a 4-mpg difference between CR’s results and Infiniti’s stated mileage values, Fisher says, adding that CR hasn’t seen as large a discrepancy in several years."

I feel duped. Nissan/Infiniti needs to be sued and owners/lessees compensated for the difference. Hyundai had to do this in the past.
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post #15 of 24 Old 04-20-2019, 01:11 PM
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I'm still clocking in at 21.x MPG according to the vehicle displays. Doesn't matter if I'm driving in the suburbs or doing 3+ hour road trips. Love the car, this is the only knock I have on it so far.
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post #16 of 24 Old 04-20-2019, 02:52 PM
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I took a trip yesterday and drove 120 miles to the destination all highway in ECO mode and averaged around 78 mph and got 26.1 mpg. On the trip home I kept it in standard mode and about the same mph and got 25.6mpg.
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post #17 of 24 Old 04-26-2019, 06:21 PM
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I am getting over 27mpg mixed since I got mine in July.
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post #18 of 24 Old 05-07-2019, 01:02 PM
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Better Than You Think!

Like most of you, I have complained about the mpg of my new 2019 QX50 Essential Sensory being so far off from the promiseof the EPA’s 24/30, combined 26 mpg ratings. The Consumer Report study some of you cite says those numbers are inflated by 15%, using their track simulations test process. But what should I expect to get in the real world? Some facts:

What is the EPA test? Their web site says:

“The "city" program is designed to replicate an urban rush-hour driving experience in which the vehicle is started with the engine cold and is driven in stop-and-go traffic with frequent idling. The car or truck is driven for 11 miles and makes 23 stops over the course of 31 minutes, with an average speed of 20 mph and a top speed of 56mph. The "highway" program, on the other hand, is created to emulate rural and interstate freeway driving with a warmed-up engine, making no stops(both of which ensure maximum fuel economy). The vehicle is driven for 10 milesover a period of 12.5 minutes with an average speed of 48 mph and a top speedof 60 mph. Both fuel economy tests are performed with the vehicle's airconditioning and other accessories turned off.” It further says the combined rating is the weighted average of 55% cityand 45% highway.

I must say that my “city” driving is not that slow/stop and go, so the typical 22 mpg I get is maybe not so comparable (although it is far far better than the CR report’s 15 mpg measurement!!) A better test for me is my recent extended highway trip. I went 250 miles with cruise control on 65 mph in one direction, and then returned doing 75 mph in the other. The trip included going over a 3000 ft mountain and foothills, so not a flat ride for about a third of the trip. And the air conditioner was on. On the first leg I got 29.8 mpg, and on the return I got 26.1, as measure by the car. When I did the actual calculation, it was actually 7-9% lower (another disappointment, but that’s another story) at 28mpg (9% below the predicted 30) and 25 (17% below 30).

BUT…

I then researched the effect of speed on mpg. I found several studies saying that versus driving at 50 mph (the EPA’s test speed), driving at 60 mph decreases mpg by 3-7%, 65 decreases it by 8-15%, 70 by 17-24%, 75 by 23-34%, and 80 by 28-42%. A lot. My experience was at the low end of or below those ranges.

Then I compared the QX50 EPA ratings to those of 6 competitors: Audi Q5, Acura RDX, Volvo XC60, Mercedes GLC300, Lexus NX300 and BMW X3. All had ratings a good 8-12% worse than the QX50, and presumably they too actually perform a least a bit below their ratings (CR says so, too). And of course they should be similarly impacted by driving speed. But my actually performance was about what their ratings are even though I was driving a lot faster!

My conclusion is that the QX50 indeed delivering on the EPA mpg ratings promise when you include the impact of speed, and it is doing at least a bit better than its competition. Now if I could just get myself to drive as slowly as those EPA tests!! Meanwhile, I will quit complaining now.

Last edited by tj2433; 05-07-2019 at 01:10 PM.
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post #19 of 24 Old 09-25-2019, 10:26 PM
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Quote:
Originally Posted by tj2433 View Post
Like most of you, I have complained about the mpg of my new 2019 QX50 Essential Sensory being so far off from the promiseof the EPA’s 24/30, combined 26 mpg ratings. The Consumer Report study some of you cite says those numbers are inflated by 15%, using their track simulations test process. But what should I expect to get in the real world? Some facts:

What is the EPA test? Their web site says:

“The "city" program is designed to replicate an urban rush-hour driving experience in which the vehicle is started with the engine cold and is driven in stop-and-go traffic with frequent idling. The car or truck is driven for 11 miles and makes 23 stops over the course of 31 minutes, with an average speed of 20 mph and a top speed of 56mph. The "highway" program, on the other hand, is created to emulate rural and interstate freeway driving with a warmed-up engine, making no stops(both of which ensure maximum fuel economy). The vehicle is driven for 10 milesover a period of 12.5 minutes with an average speed of 48 mph and a top speedof 60 mph. Both fuel economy tests are performed with the vehicle's airconditioning and other accessories turned off.” It further says the combined rating is the weighted average of 55% cityand 45% highway.

I must say that my “city” driving is not that slow/stop and go, so the typical 22 mpg I get is maybe not so comparable (although it is far far better than the CR report’s 15 mpg measurement!!) A better test for me is my recent extended highway trip. I went 250 miles with cruise control on 65 mph in one direction, and then returned doing 75 mph in the other. The trip included going over a 3000 ft mountain and foothills, so not a flat ride for about a third of the trip. And the air conditioner was on. On the first leg I got 29.8 mpg, and on the return I got 26.1, as measure by the car. When I did the actual calculation, it was actually 7-9% lower (another disappointment, but that’s another story) at 28mpg (9% below the predicted 30) and 25 (17% below 30).

BUT…

I then researched the effect of speed on mpg. I found several studies saying that versus driving at 50 mph (the EPA’s test speed), driving at 60 mph decreases mpg by 3-7%, 65 decreases it by 8-15%, 70 by 17-24%, 75 by 23-34%, and 80 by 28-42%. A lot. My experience was at the low end of or below those ranges.

Then I compared the QX50 EPA ratings to those of 6 competitors: Audi Q5, Acura RDX, Volvo XC60, Mercedes GLC300, Lexus NX300 and BMW X3. All had ratings a good 8-12% worse than the QX50, and presumably they too actually perform a least a bit below their ratings (CR says so, too). And of course they should be similarly impacted by driving speed. But my actually performance was about what their ratings are even though I was driving a lot faster!

My conclusion is that the QX50 indeed delivering on the EPA mpg ratings promise when you include the impact of speed, and it is doing at least a bit better than its competition. Now if I could just get myself to drive as slowly as those EPA tests!! Meanwhile, I will quit complaining now.

You work for Nissan/Infiniti right? JK....
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post #20 of 24 Old 09-26-2019, 11:36 AM
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no matter what I do, 21.x MPG mixed driving.. My expectations when seeing 24/30 is that mixed driving would fall somewhere in the lower end of that range, not well below the city driving number.
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