Fuelly

i stopped using once got new car and it displays info per trip.
 
Yup still use it at every fill up and in between to set reminders for stuff like rotation and maintenance etc.

Very easy to pull logs to see exactly what I paid for what when and get a very accurate real cost of ownership.
 
Neuk_ said:
Why?
Click to expand...

So the objective, for me at least, was always to improve driving efficiency thus seeing it displayed in real-time (well last interval) and for trip thus far meets that objective better.

Knowing how much I get off a full tank means lesser to me now given the above. Yes it’s nice knowing the range but really.. so what? Knowing what and why efficiency goes crap vs driving style is more powerful and thus the feedback loop is faster on a per trip basis (whether semi inaccurate or not).

That being said.. I generally get good mileage these days but then I also drive like a old person. The problem with fuelly is that it’s a guesstimate based on input fuel give. An unknown amount in the tank.. if that level of inaccuracy is ok.. the modern car guesstimate on fuel consumption I reckon is ok too.

But that’s just me.. I use Waze so can pull up a mileage per year if needed and with location tracking I can pull routes too.
 
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krycor said:
i stopped using once got new car and it displays info per trip.
Click to expand...
Except that cars' fuel range/consumption are notoriously inaccurate, often under-reading the consumption by quite a big margin.

I'm actually fighting with JLR about that- the Range calculation on my RRS is very inaccurate, so much so that I could keep driving for almost 150km after it has shown the range to be zero.

The fuel consumption is also more optimistic than what I calculate on fuel used vs km driven, by about 1.5-2 l/100km.

This was the same in both previous A3s that we've owned, although not to the same extent.

The ONLY way to get an accurate calculation of your fuel consumption is to measure the distance driven and fuel consumed and then calculate it.

Of course, you should eliminate other variables by measuring the distance via GPS, always filling up to the auto-fill level (aka first click), at the same pump, at the same petrol station, at the same time of day, tyres always at the same pressures, etc.

But relying on the car to give you an accurate record of your fuel consumption is to fool yourself into thinking that your car is more fuel efficient than it really is.
 
krycor said:
So the objective, for me at least, was always to improve driving efficiency thus seeing it displayed in real-time (well last interval) and for trip thus far meets that objective better.

Knowing how much I get off a full tank means lesser to me now given the above. Yes it’s nice knowing the range but really.. so what? Knowing what and why efficiency goes crap vs driving style is more powerful and thus the feedback loop is faster on a per trip basis (whether semi inaccurate or not).

That being said.. I generally get good mileage these days but then I also drive like a old person. The problem with fuelly is that it’s a guesstimate based on input fuel give. An unknown amount in the tank.. if that level of inaccuracy is ok.. the modern car guesstimate on fuel consumption I reckon is ok too.

But that’s just me.. I use Waze so can pull up a mileage per year if needed and with location tracking I can pull routes too.
Click to expand...

Yeah, Fuelly or similar will never give you real time, you'll have to rely on your OBC to give you that and results will very with regards to accuracy.

I am not sure how you get to the bold bit though, Fuelly does a calculation based on how much you put in your tank and how many km's travelled, and will ignore or discount non filled tanks. It has always been more accurate than any of my cars OBC's when looking at long term fuel use.
 
Naks said:
Except that cars' fuel range/consumption are notoriously inaccurate, often under-reading the consumption by quite a big margin.

I'm actually fighting with JLR about that- the Range calculation on my RRS is very inaccurate, so much so that I could keep driving for almost 150km after it has shown the range to be zero.

The fuel consumption is also more optimistic than what I calculate on fuel used vs km driven, by about 1.5-2 l/100km.

This was the same in both previous A3s that we've owned, although not to the same extent.

The ONLY way to get an accurate calculation of your fuel consumption is to measure the distance driven and fuel consumed and then calculate it.

Of course, you should eliminate other variables by measuring the distance via GPS, always filling up to the auto-fill level (aka first click), at the same pump, at the same petrol station, at the same time of day, tyres always at the same pressures, etc.

But relying on the car to give you an accurate record of your fuel consumption is to fool yourself into thinking that your car is more fuel efficient than it really is.
Click to expand...

Most manufacturers are 'conservative' with their fuel use/range calculations, I am not sure exactly why though, I used to push my 9n Polo well past the 0 km's to go point.
 
Naks said:
Except that cars' fuel range/consumption are notoriously inaccurate, often under-reading the consumption by quite a big margin.

I'm actually fighting with JLR about that- the Range calculation on my RRS is very inaccurate, so much so that I could keep driving for almost 150km after it has shown the range to be zero.

The fuel consumption is also more optimistic than what I calculate on fuel used vs km driven, by about 1.5-2 l/100km.

This was the same in both previous A3s that we've owned, although not to the same extent.

The ONLY way to get an accurate calculation of your fuel consumption is to measure the distance driven and fuel consumed and then calculate it.

Of course, you should eliminate other variables by measuring the distance via GPS, always filling up to the auto-fill level (aka first click), at the same pump, at the same petrol station, at the same time of day, tyres always at the same pressures, etc.

But relying on the car to give you an accurate record of your fuel consumption is to fool yourself into thinking that your car is more fuel efficient than it really is.
Click to expand...

The Range calculation is based on the assumption that car-clueless MILFs will be driving around with no petrol in the tank. My wife's BMW is the same. Reserve comes on and it is easy to get another 200kms....
 
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