Biggest MPG error you've seen on your uncalibrated gauge? (Nissan X-trail SG/UG)
 

How about 40%?

My brother recently replaced his Honda Ridgeline with a Nissan X-Trail (predecessor to the Rogue, not sold in the States). Went from...

• 3.5L V6 AWD automatic (Honda), to...
• 2.5L 4-cylinder AWD 5-speed (Nissan)

http://www.auto123.com/ArtImages/100...-trail-i01.jpg

I loaned him my ScanGauge and set the engine size. We were really impressed with the early numbers he was getting, but became progressively more skeptical as the gas gauge approached E.

The first tank was off by a whopping amount:

Indicated: 6.7 L/100 km = 35 mpg US
Actual: 11.2 L/100 km = 21 mpg US Correction: 9.6 L/100 km = 25 mpg US

That's a huge error. 40% 29% !

Anyone else seen a gauge off by that much?

I'm sure I set the engine size. Have to double check of course. Hopefully that's all that's wrong.

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FYI, the "updated" NRCAN (post-2008 EPA similar) ratings for the Nissan are:

• city: 12.2 = 19 mpg
• highway: 9.5 = 25 mpg

He's still doing better than the Ridgeline, which was rated:

• City: 15 mpg (US)
• Highway: 20 mpg (US)

But not as well as we thought!

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Update: it wasn't quite as bad as we first thought: the gas receipt was 51.3L for 537 km (he guessed the volume when he told me, earlier). That's 9.55 L/100 km = 24.6 mpg US.

That's still a 29% error though.

The wife regularly averaged 27-28 in her Rogue. On a road trip I managed to hit close to 33 with some atrocious weather (raining cats and dogs for a couple of hours). I think I got close to 473 miles out of that tank, the light came on just before we got home with less than two gallons left on the refill.

regards
Mech

Wow, quite the difference in MPG ratings:

Rogue: 22 city / 27 hwy for the automatic 2013 AWD 4 cyl, 2.5 L

Yeah, she drove my CVT insight for a week and averaged 56 MPG. Accelerate at about 1800-2000 RPM and let it get in top gear early, about 40 MPH. The torque converter locks up by the time you clear an intersection, more like a clutch than a converter. I didn't coast in neutral in her Rogue, it was brand new and I didn't want to give Nissan any excuse to deny a warranty claim. I think the CVT is warrantied for 10 years and 120k miles. Only mode was to air up the tires.

regards
Mech

My TSX UG is off by 10% by default. I had to adjust the "gallons used" to calibrate fuel consumption.

The UG in the Camry seems spot on without any calibration.

Our 2011 LTZ Cruze with 6A-transmission (first year production) was consistently 5-7% optimistic. Later models, especially with 6M-transmissions, were often better, only 1-2% optimistic, with 6A-models 2-5% optimistic.

8% in the Odyssey 3.5 V6 5AT.
16% in my Fit with heavy EOC P&G driving. My old Civic was similar.

Still not seeing any stories of a 40% error in "normal" use.

However, it turns out my brother was "estimating" how much fuel he put in his Xtrail. Doh. (He's not fuel economy focussed.) He did get the receipt though, so I can check it later today and do proper calcs. And ensure the right engine size was used in the SG.

40% is HUGE!! SCII was 17% generous on my 05 Corolla & I thought that was a lot.

My scan guage turns off when I try EOC. :(. So I really don\'t know much better my mileage is if I tried EOC.