Set new personal MPG record - Infiniti Q50 Forum
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post #1 of 18 (permalink) Old 08-12-2019, 11:54 AM Thread Starter
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Default Set new personal MPG record

Because I was in no hurry to get back home this morning from my trip to Cherokee, I wanted to maximize the MPG. As I've said before, since there are more downhill parts than uphill ones, it is easy to induce the car into EV mode quite often. Also, many of the downhills are steep enough to allow the car to actually charge the hybrid battery while still in EV mode (with foot off the "go" pedal). When I pulled into my garage, the gauge read 45.8 - it actually was at 46.5 when I got on I-75 about 15 miles from home. Figuring on a 5% overage in the gauge, that still comes out to about 43.5 mpg for the trip home. It read about 38.5 on the trip there. It's great having a car that gets great gas mileage, but also has a lot of power and torque when it's needed. It's a shame that Infiniti decided to drop the hybrid from the line-up.
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post #2 of 18 (permalink) Old 08-12-2019, 12:01 PM
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Sometimes Iím shocked at how fuel efficient my Hybrid is. I agree itís almost unthinkable that Infiniti dropped the Hybrid for 2019 with rising fuel prices especially premium grade.

However Iím looking forward to the new technology and EV vehicles coming from Infiniti in a few short years.
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post #3 of 18 (permalink) Old 08-12-2019, 12:52 PM
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I don't know if its something wrong with my car, the wider and taller Michelin's I put on it or what, but I cant get above 26 MPG. I drive 32 miles to work, 90% of it is highway, 70 mph. slight hills but nothing big. Car has 74K on it and when I had the Bridgestone runflats on it last summer when I first got the car, I was able to get 28.6 consistently with the occasional 32 mpg if i really worked the EV mode. Seems like the car hardly kicks into EV unless I am downhill and as soon as I press the accelerator pedal, the engine kicks on. Could my batteries be bad? I'm starting to regret putting these tires on if its what is causing the issue.

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post #4 of 18 (permalink) Old 08-12-2019, 03:23 PM Thread Starter
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I don't know if its something wrong with my car, the wider and taller Michelin's I put on it or what, but I cant get above 26 MPG. I drive 32 miles to work, 90% of it is highway, 70 mph. slight hills but nothing big. Car has 74K on it and when I had the Bridgestone runflats on it last summer when I first got the car, I was able to get 28.6 consistently with the occasional 32 mpg if i really worked the EV mode. Seems like the car hardly kicks into EV unless I am downhill and as soon as I press the accelerator pedal, the engine kicks on. Could my batteries be bad? I'm starting to regret putting these tires on if its what is causing the issue.

I am sure that it is not the tires. If you consistently drive 70 mph on the highway, you will very rarely have the car go into EV mode unless you are going downhill. If you have the cruise control on, it just won't go into EV mode at 70 mph. A lot of the trip back from Cherokee to Chattanooga is on two lane, winding roads, so I had to keep the speed down there. As I said, I was able to induce the car into EV mode a lot, and even on a straightaway, with the hybrid battery full, I was able to go around four miles - or more - in EV mode, even going 60 mph. Luckily, traffic was light, and I didn't slow anyone down behind me when I decided to keep the speed in the 50-55 mph range on a straightaway. If you want to experiment a little, try driving that course during a time when there is little traffic, and keep the speed at no higher than 60 mph. I would bet that the mileage will be close to 30, if not more, if you induce it into EV mode as much as possible.



To be accurate here, when I have done all the driving around my house, with trips of a mile or two or three, the mpg does suffer, because the car has to be warmed up to be in EV mode. One hundred percent local driving will give me mileage in the mid 20's.

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post #5 of 18 (permalink) Old 08-12-2019, 03:42 PM
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What drives me crazy is that before i changed the tires and put a Stillen rear sway bar, I was able to be 28.6 consistently up to 30+mpg at those same highway speeds. Now that I made those two changes, I'm lucky if I can get to 26.5 and stay there for long. Not doing anything different. Does anyone know of any diagnostics the dealer can do to check the battery capacity or even the torque in the electric motor? I feel like the engine kicks on as soon as I need a bit of power to increase speed.

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post #6 of 18 (permalink) Old 08-12-2019, 04:31 PM
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New tires. The bar has nothing to do with it.
I'm quite happy with mine. Took a 6 hr road trip from NH to Norwalk CT. Rt 91S to Ct 15 Wilber Cross hyw. Set CC to 73 mph on the way down. I hit 27.6 indicated MPG there, but on the way back, tons of traffic. Then north of Hartford CT I came up on a BMW i8. Beautiful car!!

We played for a while when safe. 2 minutes on my gps averaged 107 mph. Then up hill from MA to my house in NH. Tank calculated at 24.8 MPG, with 2 trips to the P.O., a 300' hill climb each trip. No complaints.

The BMW i8 gets over 110 MPG and is 600 lbs less. It was quicker, but not faster. Looks like a supercar.

Just wait to see what's available in 5 years!

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post #7 of 18 (permalink) Old 08-12-2019, 06:13 PM
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Your tires affect everything from handling, braking and acceleration, to yes Ė even gas mileage. In fact, many tire manufacturers are now featuring a fuel efficiency rating for their tire models. Tires affect vehicle fuel efficiency primarily through rolling resistance

https://www.dunntire.com/blog/How-do...ct-gas-mileage


The short answer: yes. Tires can make a big difference in the number of miles a driver gets to a tank of gas. And it's not all about tire maintenance; even the kind of tire on the car can affect the fuel economy.


https://www.consumerreports.org/cro/...nomy/index.htm (From the toilet paper proís)

Your carís tires can play an important role in helping you get the best gas mileage and save money at the pump. Checking tire pressure regularly is one step toward optimum fuel economy, but your choice of tires can also help.

Automakers often specify low-rolling-resistance tires as original equipment to enhance vehicle performance in government fuel-economy tests. But replacement tires are not limited by any vehicle manufacturer's requirements, and attributes such as all-season grip and tread life are big selling points. In the past, consumers often had to weigh a trade-off between low rolling resistance and other performance capabilities, such as wet braking. But in recent years, tire manufacturers have been achieving a better balance of rolling resistance and all-weather grip.

Consumer Reports recently tested a few all-season tire models with low rolling resistance and found that those tires can improve fuel economy by an additional one or two mpg. The reward for replacing a less-optimum tire can be a payback covering most of the cost of the new tires over their lifetime in fuel savings. Moreover, you generally don't have to pay more to get a tire with better rolling resistance.

Here are some additional tips for getting the most fuel economy from your tires:
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post #8 of 18 (permalink) Old 08-12-2019, 06:41 PM
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And the tips ARE? LOL
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post #9 of 18 (permalink) Old 08-12-2019, 08:26 PM
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Selzini is right, here in Australia the speed limit on the freeway is 90km/h to 110km/h (56mph to 68mph). We have a heavy policing policy with alot of mobile and fix speed camera. Go over 5% of the marked speed and you'll get a ticket and $$$. Most of the time its 90km/h or 56mph limit.

The hybrid works best at lower speeds or city traffic. I get constantly 32MPG or 7.4litres per 100km monitored via fuelly app not the onboard trip meter. I notice that the hybrid uses about 0.3litres per 100km more in winter.

Tyres, I run sticky Falkens FK510 and there is no detectable increase in fuel use. I do however have the tyres pumped up to 35-36PSI all round which possibly decrease the rolling resistance.

You can try disconnecting the 12V battery and let the ECU re-learn your driving style.
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Last edited by mva; 08-12-2019 at 08:36 PM.
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post #10 of 18 (permalink) Old 08-12-2019, 08:38 PM
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Quote:
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And the tips ARE? LOL
Unless he’s going to race a heavy 4 door luxury sedan LOL X 1000, he has a lot of choices.

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