is the long range mpg recorded only when the Move&Fun app is connected.. loosing data when disconnected? Or does it also record when your phone is not plugged in and sync when it is next? just wandered. thanks

There is 2 individual recorder. Number 1 resets itself after 2 hours. Number 2 you reset when you want to. Push shortly reset button so you can change to number 2 recorder. 

 

My terms might sound odd but I hope this helps. 

10 hours ago, NCC-74656 said:

is the long range mpg recorded only when the Move&Fun app is connected.. loosing data when disconnected? Or does it also record when your phone is not plugged in and sync when it is next? just wandered. thanks

What does this even mean? I've never seen a car with a "long range mpg" reading. What I have seen is an "available range" value, which is updated when you're driving, and when you add fuel to the tank.

Trip computer tells average consumption. How accurate it is is another story. But it tries. 

I think the OP is maybe asking about fuel economy stats recording, not about estimated no. of miles left until the tank is empty.

 

I don't bother checking MPG these days, as filling up my Citigo is such a rare event, and I haven't checked the (mostly useless) Move&Fun app to see whether there is a short/recent trip MPG and a cumulative MPG, as is common on many cars (and all the 7 or so VAG cars we have had in the past). The data is almost certainly stored on the car's ECU or other similar electronics, and just displayed on the "MoveButNoFun" app.

 

In any case these kind of readings are not often very accurate, and the only way to check MPG is to record mileage and no. of litres that go into the tank on each fill - even then, if you want to be as accurate as possible, ignore the odometer reading, and record mileages using a satnav that tracks journeys (but that would be getting a bit OCD).

 

19 hours ago, freemansteve said:

 

 

In any case these kind of readings are not often very accurate, and the only way to check MPG is to record mileage and no. of litres that go into the tank on each fill - even then, if you want to be as accurate as possible, ignore the odometer reading, and record mileages using a satnav that tracks journeys (but that would be getting a bit OCD).

 

Strangely every skoda I have checked is about 8 to 10% optimistic with the speedo, eg a true 70mph is likely to say 76 or 77 on the dial.

However the trip meter, which is used to work out the fuel consumption is normally spot on. I checked on several journeys with a TomTom some years ago and on a 100 mile planned journey on the TomTom in my Yeti, the odometer recorded 100.1 miles.

 

The sppedo is deliberately optimistic to reduce speeding and remove any possibility of the driver being over the limit when the speedo says he is at or under it. However the odometer is used for so many functions, including calculating fuel consumption, when service items are due etc, that it has to be as spot on as possible. The only variance is due to how much tread is worn on driving wheels.

It also has to correspond with distance marked on roads or drivers would notice it was wrong.

Edited 8 September, 20196 yr by kenfowler3966

Yes, that's right; obviously the speedo has to be set optimistically.

 

The problem with odometers is that their accuracy essentially depends on wheel rotation counts, so distance travelled will then depend on tyre pressures, car loading, or how worn a tyre is - as you say....

 

But  don't forget that on most cars, there are usually several OEM wheel and tyre combinations that get sold. On mine for example, it came new with 185/50 R16 wheels and EcoContact+ tyres, while others have 15" or 14" wheels with varying brands and models of tyres, each with varying widths and profiles and in fact, slight variations in rolling radii!

 

The point being that the rolling radii, while you'd expect them to be same on equivalent tyres, do actually vary several percent. A car's odometer may well be quite accurate in a given case, if it had been calibrated to a specific tyre, but in other cases it will not be quite as accurate. Bear in mind I said "if you want to be as accurate as possible", not that odometers are wildly wrong.

Edited 8 September, 20196 yr by freemansteve
grammar

OEM tyre diameter is about the same even if wheel size is different. It is compensated by tyre profile. Larger wheel means thinner tyre profile. Difference is 1% or less. 

13 minutes ago, Emil said:

OEM tyre diameter is about the same even if wheel size is different. It is compensated by tyre profile. Larger wheel means thinner tyre profile. Difference is 1% or less. 

 

Yes, obviously OEM fit will try to ensure rolling radius is very close in all cases, for obvious reasons, but from having looked  carefully at this in the past for various "same" tyres, I have come across 3% or more differences in circumference - which is what counts (it may be 1% radius, but it's 2 x Pi x R of course)