[fotomoto]

I bought the cube as my urban runabout but I took my first day long trip in it while surpassing the overall 2,000 mile mark.

The entire route was interstate, relatively flat (some rolling hills) with light winds on the outbound leg. I gassed up in town, about a mile to the interstate, and then locked her down via the CC to 68-70mph, a/c set to 72f for the duration. I was very dismayed to see the instant MPG display reading anything from 24-28mpg on steady throttle. The overall MPG display settled on a "dismal" 28.7mpg after about 100 miles. That's about what I get in town! Hmm.

Flipping through the different settings, it finally occurred to me that my average speed display was very, very wrong; only 38mph! How can that be? I didn't reset it too at the fuel station and reflected my previous around town tank. DOH! I immediately reset it, nothing else, and my instant mpg shot up to the 30-35mpg range and by the time I arrived at my 1/2 way destination the overall mpg registered a more normal 31.5mpg. Interesting.

Leaving on the identical return leg while still on the same tank, I reset everything this time. I was now headed into a moderate headwind and the overall mpg for this leg netted me 30.1 mpg. 320 miles total and still had 2 bars left on the gauge.

 

[none]

Oh no... I hope this isn't how the computer works

 

[Pejay66]

After 9,000 on my CUBE a few comments on the 'Puter. First, even if you have cruise set at a speed, small rises and slight dips in the road change demand on the engine so you will see a variance on mpg readings. Also the average miles number does that on all Nissans. Just press and it resets. I never thought this was anything one really needed.

Pejay66

 

[fotomoto]

Also the average miles number does that on all Nissans. Just press and it resets. I never thought this was anything one really needed.

I'm not sure we're on the same page here. I'm talking the avg. speed display (MPH). Initially, I didn't reset it so it indicated very low (38ish MPH) due to the previous tank/reset being primarily city driving. So on the interstate trip, my instant MPG was lower than expected (only high 20's). Once I reset the avg. speed, it calculated a more true real time MPH reading in the high 60's that I was doing on the highway trip. Once this happened, my instant MPG display went from the high 20's to the low 30's.

This leads me to believe that the instant MPG calculation is somewhat based on avg. speed reading and not solely on the current speed/fuel flow rates. I'm hoping someone will check this and can duplicate (or not) my experience.

 

[Pejay66]

I believe it is the average speed.

Pejay

 

[fotomoto]

I'd really like to hear from others on this. Anyone tried or verified it?

On a straight, level road with preferably little to no wind and with the CC on: read your instant mpg, cycle through the computer to the avg. mph display, reset it, and then cycle through back to the instant mpg and see if it has changed. Obviously it fluctuates nearly constantly but see if the readings have trended up, down, or stayed the same.

 

[none]

I was not as scientific about it (hard to find level ground around here) but reset my average speed & noticed a difference in MPG right away. But it seems to have averaged back out in the end.