Nuvi 3597LMT

[Swannie]

I'm looking at buying a new(hopefully my last) GPS'r and had a peep at the nuvi 3597LMT, but there is something that have me wondering. Under Features and Benefits it is stated next to ecoRoute : Purchase separately. Does that mean it does not the same functionality as for instants the nuvi3790 with it's At the Pump, ecoChallenge, Fuel Economy, Mileage Report etc, readily build in?

[Phillip Coetser]

Hi Swannie, Phillip. I own a Nuvi 3597LMT, and from the main screen, I

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touch apps, and the following screen appears.Then, when you touch the eco route icon, the next screen appears. If you own a smartphone, you can link your smartphone to the Nuvi, and from there, you can decide what services you need, at a cost. Hopes this helps.

[Swannie]

Thanks Phillip,
Can you tell me what the cost is for instants the AT THE PUMP function.

[Phillip Coetser]

Hi Swannie, Phillip. Pardon me, but I don't understand your question. I've uploaded a screenshot of the "At the Pump", from the Nuvi 3597 LMT. Please send me a private "email" with your cellphone / landline no:
Regards.

[fugglefeet]

Hi Swannie,

The "At the pump" function and screen is to help with the fluctuating fuel prices (Only is South Africa ). This function allows you to program the latest fuel prices on the fly when filling up and helps to keep your fuel usage costs as accurate as best possible. Looking at the screenshot that Phillip uploaded, if you enter the recent fuel price at the pump into the textbox below "Fuel Price" and press Next, the unit will prompt you if you only want to set the fuel price and then you press "Yes". Once this is done, you're pretty much sorted and you can then start to monitor your fuel usage using the GPSr. I have found that the GPSr is out by about 0.3l/100km and the reason for this is the aircon (since I have the benefit of an onboard computer that also monitors the fuel consumption). This may of course vary from vehicle type to vehicle type. Hope this helps.

Darryl

[Swannie]

Hi Darryl,
I'm well aware of the uses of the ecoRoute functionalities because it is in the nuvi 3790 that I have, but wasn't sure whether it is included in the 3597 LMT because it says " Purchase separately" on the Data Sheet.
What interest me now is that you say you found the GPSr to be out by 0.3l/100km. I also found it to differ by about that much from the car's on-board computer(Yes my little Polo has one), but it is my take that the on-board computer is out. In the first instants the speedo is fast by 5% (even verified with a stop watch over measured 2km). I can't use the GPSr's cumulative km between fills, because it isn't always on from fill up to fill up, therefore I have to use the cars trip-meter for the km and if you calculate it yourself you will get the same as the GPSr. It is a known fact that the GPSr does not correct for gradient in distance calculation, but even on a flat surface the car's speedo is fast by the same percentage.
Am I making the point clear why I recon the GPSr to be more accurate than the on board computer?

[fugglefeet]

Hi Swannie,

I see the logic in your statement and why you say the GPSr is more accurate (based on the speed factor). I take it you have on several occasions done the comparisons between the GPSr and the manual calculation for the fuel consumption, finding the two to be as close as damnit. The maths being:-

(Litres of fuel used divided by the distance travelled) multiplied by 100 = Litres of fuel used per 100 kilometres.

The intriguing part is how the GPSr manages to calculate the fuel consumption. Something I will google and post here once found.

Darryl

[Swannie]

Hi Darryl,
The GPSr does the same calculation what you and I will do. You have to feed it the mileage (km) and the fuel used (liters) measured by the petrol pump at the garage you are at. The other calculation what it does (fuel used after a trip) is based on the the character of the vehicle (vehicle profile) you told it you are driving. You inputs is for typical urban and highway km. It is my guess that, that will probably depend on the speed you driving at.???
Why would you have said the error was due to the aircon?

Swannie

[Swannie]

At The Pump:
You will probably be saying, I'm running away with this, but Okay. I always fill up the car when adding fuel and update the GPSr every time. I then download the At_the_pump file under Reports on the nuvi. It is a CSV file which I then save it as an .xls file. There I play around with it, adding graphs and follow the trends and average fuel consumption. There is also a website https://www.fuelly.com/dashboard where you can update and compare your cars consumptions with similar cars. It also draws a graph for you and keep book of your total fuel cost. When in Feully.com you can search for Swannie53.

Swannie

[fugglefeet]

Hi Darryl,
The GPSr does the same calculation what you and I will do. You have to feed it the mileage (km) and the fuel used (liters) measured by the petrol pump at the garage you are at. The other calculation what it does (fuel used after a trip) is based on the the character of the vehicle (vehicle profile) you told it you are driving. You inputs is for typical urban and highway km. It is my guess that, that will probably depend on the speed you driving at.???
Why would you have said the error was due to the aircon?

Swannie

Hi Swannie,

On one occasion when I was doing a trip, I compared the trip computer consumption figure with that of the fuel consumption figure of the GPSr and found the difference to be minimal and attributed this to the aircon that was running whilst travelling. I did this test with a Nuvi 2200 and a 2007 VW Jetta V and now again with a Nuvi 1410 and 2010 Audi A4. I typically got more or less the same results. The shocker is when I let the car idle and check the fuel consumption without and with the aircon on. At idle without the aircon on the onboard computer displays 0.9l/h and at idle with the aircon on the onboard computer displays 1.5l/h. Looking at this says that the aircon consumes 0.6l/h at idle and the engine works harder at low revs to counter the load from the aircon. When the engine revs pick up, the strain from the aircon decreases accordingly to around 0.3l/100km. Sounds odd, but it's what I have monitored on both occasions.

Darryl