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)
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!
---
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.