Trip to Grasmere

[markrmarkr]

Took my wife and 8 year old son with me on a trip on Sunday, to Grasmere (past Camden).

Earlwood to Grasmere to Earlwood on one charge
Round trip was 105.1km
Started at 100% and 153km on the GOM.
Finished on the last bar and 8km flashing on the GOM.
Trip out was mostly at 75 km/h
Trip back was mostly at 70 km/h

Interesting watching the race between the distance to home on the navigator and the range to go on the GOM.

It was a great fun family bonding session.

www.dropbox.com/s/8hsz46fc39paev7/20140615_133230.jpg

[Phoebe]

Did you do it on Drive or Eco and did you have the aircon on?  I would do it on Eco with the aircon off and would expect to do a bit better than that - mind you there is only one of me and there was 3 of you

[markrmarkr]

It was in D mode and no Aircon for the whole trip. But I used eco mode to slow down a few times, mainly when off the highway. I used cruise control most of the way too.

I know what you mean about expecting better performance. Normally it's just me in the car too. That's why the first half of the trip was faster than the second half. I could see I wouldn't make it if I travelled at 75 km/h, so I slowed down a bit to 70 km/h. Traffic was pretty light, so i didn't cop too much road rage.

Also, I think that the larger diameter tyres make the economy appear worse than it is. With the smaller tyres that it came with, the car would think it has travelled farther but would still use around the same amount of energy. Hence it appears to get better economy than with the larger tyres.

[jeffjl]

So glad to see another LEAF that only shows 153km when charged to 100%

[gabzimiev]

it does seem like a disappointing result.

[Jim Hare]

I wonder how passengers affect the GOM. Much of our driving is single person and then we suddenly take a long drive with 5 of us in the car. Clearly this will have an impact, just how much is the question.

[markrmarkr]

The more grippy tyres I'm using would make the result worse too.

But I think anyone with stock tyres is kidding themselves if they think they are getting the performance the car tells them. The stock tyres make the speedometer and odometer report you are going faster and further than you actually are by about 10%.

So my 105km plus 8km would be 115.6km plus 9km, if I'd had the same diameter tyres on as everyone else.


Gab, do you know how accurate the speedo is on the i?



But to sum up -

with grippy tyres, 3 people in the car, travelling at 75 and 70 km/h, and with a speedo/odo which actually tell close to the truth; my highway range is 113km with a full charge.

[Jim Hare]

Mark, that's a new piece of information. You're saying that every LEAF ever made comes off the line with an incorrect speedometer and odometer?

[gabzimiev]

Jim nearly every car comes with a incorrect speedometer. they don't have to be "correct" www.racq.com.au/motoring/cars/car_advice/car_fact_sheets/speedo_accuracy

If you remember at one point nsw police had suburb WRX highway patrol cars. every speeding ticket issued by those high way patrol cars had to be refunded due to the speedo in the WRX not being accurate enough to allow for the on board speed carmera to use the cars speedo to work out other cars speed while the WRX was driving.

unless your after a police force contract you only have to be within the ADR rules.

[markrmarkr]

Jun 18, 2014 11:16:23 GMT 11 Jim Hare said:

Mark, that's a new piece of information. You're saying that every LEAF ever made comes off the line with an incorrect speedometer and odometer?

Jim,

Yes, that's what I'm saying. I've talked to various people on this forum who all see similar results when they do the speedo check.

It's dead easy to check. Download a speedo app for your phone (there are plenty for free) and go for a drive.

If your speedo reads 55 km/h when your GPS-speedo-app reads 50 you have 10% error, and that proves my point.

To do this test properly you need a long stretch of road where you can sit on 50 or 55 km/h, or any speed, for a while and let things settle down. But if you can't do it properly you should still be able to get a ballpark feel for your accuracy just driving around normally.

Also it's best to get a passenger to do most of the work. Not a good idea to get distracted while driving.

So how about it Jim? We are looking to you for leadership here.

Mark

[gabzimiev]

You don't have a 10% error you have a 1-5% gps error and a 5%-10% speedo error. Without land fixed point gps stations gps isn't that accurate.

[Jim Hare]

Wow, that's very interesting. I was under the impression there was a trend to lower the trigger point on speed cameras because speedos were supposed to be so much MORE accurate these days. Guess not!

I will definitely do that test.

[markrmarkr]

Jun 19, 2014 9:07:47 GMT 11 gabzimiev said:

You don't have a 10% error you have a 1-5% gps error and a 5%-10% speedo error. Without land fixed point gps stations gps isn't that accurate.

Gab,
you are too conservative. GPS errors cancel over time, and are (pseudo) random. Also orientation will change the satellites you use, and could give different results, but I've never seen any measurable difference. And if you try different apps you can confirm them against each other (I've never found one which was in disagreement with the others, though some are easier than others to use). But the big one is doing the comparison over a long period of time. If you get consistent results, which I do, you can be pretty sure you are on the right track, and the errors are insignificant.

Also I've confirmed my results on a Radar speed sign at my place of work.

[southernvolt]

Jun 18, 2014 11:16:23 GMT 11 Jim Hare said:

Mark, that's a new piece of information. You're saying that every LEAF ever made comes off the line with an incorrect speedometer and odometer?

Can't remember exactly where I read it but I remember reading that all Nissan's are like that. Something about a built in error. It is certainly true that our X-trail is 10% off. We've checked it a number of ways including the big radar sign on the highway approach back into Melbourne and when the cruise is set at 108 we're doing 100.