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Re: Speedometer Reads 6% High

Sat Jul 02, 2016 11:52 am

LeafMuranoDriver wrote:
NeilBlanchard wrote:Right, the 17" stock wheels are probably much more accurate. The 16" stock wheels are the ones that are having the much lower accuracy - the speed and the distance registered on the odometer are too high.

Do you have proof of the bold part? I think if there is definitive proof, many that dropped their 4th bar right after 60k miles could show this proof and the car would actually be under 60k miles and qualify for a new battery.

I compared both my GPS and Google Maps against my '15 Leaf S odometer, and it was 2.3% too many miles. This has now changed after we got a software update down a bit.

We used winter tires that are a larger diameter basically the same as the stock 17" tires, and then it was only 0.5% too high.

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Re: Speedometer Reads 6% High

Sun Jun 03, 2018 11:36 am

I know I’m posting on an old subject but it appears to still be a current problem.

My new 2018 Leaf consistantly reads 6% high compared to gps, radar signs and timed miles. I had the same issue with my 2013 Leaf. I own several vehicles and none of the others are off at all.

I suspect there’s more to it than a simple manufacturing error.

First off, electric cars are all about range. Wind resistance increases exponentially with speed and at freeway speed your miles per kilowatt decreases rapidly the faster you go. If your car is saying you’re traveling 65 but in reality you’re only going 60 it makes a difference. Bottom line is Nissan is fudging (lying about) their numbers.

Secondly I lease my car therefore I pay for miles beyond my contract. I will likely go over my miles and that 6% error will equate to 2700 fake miles at the end of my lease for which I will receive a bill for $405

I don’t believe any of this is an accident.

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Re: Speedometer Reads 6% High

Mon Jun 04, 2018 10:14 am

The accuracy of the speedometer and odometer will vary based on tire size and even the amount of tire wear, since a worn tire is smaller than a brand new one. I've had many cars from many manufacturers over the last 40 years of driving and I would say every single one showed an actual higher speed than GPS and this started before GPS was widely available.

Car manufacturers need a reliable way to gauge speed and the only sensible way to do that is to measure the speed of rotation of a tire(s) and convert that to speed. They cannot control what tires are on the car so all or nearly all of them show a slightly higher speed than actual. 6% seems a little high but I don't think it is a conspiracy to inflate the efficiency of the car. It's just a small buffer built in for tolerances, different tire brands and sizes and of course, the required legal CYA. If the speedo read low, people would probably try to sue the car mfg's to recover ticket fees, lost time, emotional distress, etc after receiving a speeding ticket...

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Re: Speedometer Reads 6% High

Mon Jun 04, 2018 12:37 pm

Speedometer error is coded into the vehicle. This is disgusting EU requirement which is heavily abused by Nissan.
Car actually knows the speed.
Find a place to drive with constant speed for one minute.
Engage cruise control at 100km/h for example.
RESET average speed reading.
Wait 30 seconds. Observe average speed reading WITHOUT changing cruise speed.
Compare to GPS data.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
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Re: Speedometer Reads 6% High

Mon Jun 18, 2018 11:14 pm

In the 's trim ' I just picked up it appears that this it is also off by about 6%. This appears to be the difference between having a 16" (S trim) tire versus a 17" tire (SL,SV trim). Odometer also appears off by same amount. So this may still be a problem. Checking with the dealer.
Glacial Pearl 2011 LEAF SL, QC delivered 4/21/2011
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Re: Speedometer Reads 6% High

Mon Jun 18, 2018 11:34 pm

This is a handy online calculator:

For a 6% correction in circumference on a 2018 S tire, you could switch to 225/60 R16 tires when you replace the stock ones.
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