2023 Rogue Mileage Experiment

[oldnissanguy]

Just got back from a 3K vacation trip. Decided to do an experiment. On the way out (1K+ and not all highway) I used ECO mode with stop light shut off turned off. I averaged 34.5 MPG. On the way back (1K+ and not all highway) in standard mode with the with the stop light shut off turned off. I averaged 33.6 MPG. Looks like the ECO mode saved me .9 MPG. I think I could have saved a little more if I had left the stop light shut off turned on, but it was really hot and it didn't seem like a good idea for a turbo motor to shut off immediately at the first stop light after exiting the Interstate. No metrics, but it did seem a little less economical when driving 80 MPH.

[D1dad]

I haven’t used the eco mode on our 2018 for the last 40k and haven’t noticed a difference in mpg. Using it for some reason made the drivetrain klunky. As far as stop/start, I agree on the turbo heat. It’s literally one of the stupidest gimmicks ever invented, that may save a quarter cup of fuel but imo beats on the starter and battery.

[VStar650CL]

As far as stop/start, I agree on the turbo heat. It’s literally one of the stupidest gimmicks ever invented, that may save a quarter cup of fuel but imo beats on the starter and battery.

It beats on the battery a bit, but the Nissan system doesn't use the starter motor. It uses the alternator as a motor, and some setups (although not the Rogue) have their own lithium auxiliary battery. In traffic the turbo isn't generally running hot, the biggest concern is actually the transmission. The S-S cars have an electric pump inside the CVT to maintain pressure during S-S operation. The ECM also knows the exact stop position of the engine, so it only takes the slightest bump to restart it.

That all said, for the amount of fuel saved versus the extra complexity added to the car, I agree that's it's a dumb idea. You can actually permanently turn it off with a simple jumper. I used a cut-off safety pin to test the concept:
post6856484.html?hilit=Stop%20Start#p6856484

For those interested in exactly how it works, here's the system description from the '23 FSM:

[oldnissanguy]

That's good info Vstar. It brings a little peace of mind but I'm probably going to try the safety pin fix at some point. The last thing I want is CVT trouble.

That just leaves the previously vetted A/C issue. When the motor shuts down the A/C compressor does as well. The traffic light cycles where I live are long enough that with the motor stopped on a hot day, my A/C is blowing hot air before the green light appears again.

[Vman62]

I've kept records of all my gas purchases since I bought my Rogue last August. If you believe the screen showing the stats on the stop/start system, then it lowered my fuel consumption by 0.35%. How much engineering cost per vehicle went into developing this system to save $10 a year in gas? One of the fall outs from the tiny 1.5L engine is idling only consumes 10.9 ml/minute.

If stop/start just had a 3 second delay before stopping the engine it would be SO much less annoying. It would accommodate the huge proportion of 'stops' that are momentary (stop signs) or permanent (pulling into a parking space).

[oldnissanguy]

I suspect that that small savings is really only relevant for the manufacture's fleet MPG numbers.

[VStar650CL]

That just leaves the previously vetted A/C issue. When the motor shuts down the A/C compressor does as well. The traffic light cycles where I live are long enough that with the motor stopped on a hot day, my A/C is blowing hot air before the green light appears again.

Yah, I've had that same complaint from a number of customers. It seems like the system firmware is responding to cabin temperature and not the temp of the A/C evap. Since the cabin temp has lots more thermal mass than the evap, it lets the evap get quite warm before it decides the engine needs to restart. That part of the system is frankly ill-considered. I can't safety pin the connector on a warranty vehicle, but I have already shown two customers how to do it themselves. I expect I'll see at least several more before the end of the summer.

[dsell]

Was your 34.5 MPG based on what the computer showed, or actual MPG calculated from fill ups? What temps were you at? The computer is off 2 to 5 MPG. I've dropped 2MPG due to the 100°F temps. 0 to 30°F will drop 5MPG. I assume you are referring to the 3 banger VCT 1.5L.

[oldnissanguy]

Based on the trip computer. I was driving much of the time in the mid to high 90s.

[dsell]

I wonder if the quantity of fuel the tank will actually hold is causing the issue with the computer being inaccurate. I dumped 13.5 gallons in mine Friday and the computer showed I had 58 miles left, a little under 1/4 of tank. It showed 30.8 MPG on 376.7 miles on auto refuel.

[VStar650CL]

I wonder if the quantity of fuel the tank will actually hold is causing the issue with the computer being inaccurate. I dumped 13.5 gallons in mine Friday and the computer showed I had 58 miles left, a little under 1/4 of tank. It showed 30.8 MPG on 376.7 miles on auto refuel.

Did you turn the ignition off while refueling? The gauge will still read right if you gas up with the ignition on, but the DTE will get wacky. That's a chronic bug in practically every Nissan cluster since '13 (and it beats hell out of me why Nissan refuses to tell Calsonic to fix it).

[dsell]

376.7 miles / 13.5 gallons = 27.9 MPG

376.7 miles / 13.0 gallons = 28.97 MPG error to the good side. Computer shows 30.8 MPG, 1.83 MPG off. But notice, it's just a little under 1/4 tank with 58 miles left or 2 gallons. That's a 15 to 15.5 gallon tank vs 13.5 advertised.

I went to fuelly dot com and it shows people's fill ups. Several are over 14 gallons, and I doubt they were completely empty.

It has to be relying on the fuel gauge to calculate mileage and distance left. As soon as you fill it up and start it the distance left updates. Instantaneous mpg must be created by an algorithm based on various sensors.

The top half of the tank always lasts the longest, remaining at full longer than it should. Once I drop below half, it drops quickly.

[dsell]

Yes, I always turn the ignition off when refueling.

[oldnissanguy]

I’ve owned 8 Nissans and all have shown the same tendency, first half of fuel gauge goes slow and second half faster.

[dsell]

Just take the numbers in the picture. Auto refuel is automatically reset after you add fuel. I know this data is incorrect as I added 13 to 13.5 gallons.

376.7 miles
30.8 MPG
58 miles left
little under 1/4 tank

376.7 miles / 30.8 mpg = 12.23 gallons used.

58 miles / 30.8 mpg = 1.88 gallons

12.23 gallons = 1.88 gallons = 14.11 gallon tank per the computer assuming they use the MPG shown.

If not, 13.5 gallons - 12.23 gallons = 1.27 gallons, 58 miles left / 1.27 gallons = 45.66 MPG?

Don't believe your computer mileage on this Rogue, calculate it. I don't believe this vehicle we make 30's at 80 MPH unless you have 40mph wind pushing you for a long distance. 60 MPH, yes, on long runs. It's a matter of physics, too high, too heavy. Every SUV in this class averages 25 to 27 unless it's hybrid. They did a good job of power for the mpg it achieves, but it doesn't do what is advertised. I drove a 2019 Jeep Latitude for 1000 miles while my Rogue was in the shop for 4 weeks. It had almost as much power, made 27MPG and I drove it hard. I'm not saying I want a Jeep, I'm just saying they didn't shatter any records with this complicated VCT engine. Maybe as Toyota is sharing engine design with other manufacturers, they will put the 2.5L in this Rogue. That engine is a fuel sipper without a turbo. Also, nobody can beat the 2.5L Toyota hybrid which is going in the Mazda CX-50 and Subaru Forester. Since Toyota no longer can build a good car to go around its powertrain, those are interesting combos.

[blazem25]

oldnissanguy is your Rogue a awd?


noticed the awd gas millage is around 5 miles lees per gallon

[dsell]

Nice long trip, no hills, very little wind, 70 MPH, 80 to 100°, ECO mode for 236 miles. The rest of the 365 was my normal 19 mile commute to work. 365 miles, 13 gallons, 28.076 MPG computer shows 33.3 MPG, off 5.224 MPG.

[oldnissanguy]

oldnissanguy is your Rogue a awd?


noticed the awd gas millage is around 5 miles lees per gallon

Thought I responded. Yes, AWD.