Range calculations

[Rusty]

Where does the E53 OBC get its data from to calculate the remaining range?

I ask as I thought my X was being inventive and running on air yesterday.

I had driven approx 350 miles since the last fill and thought I would top up so I had a full tank to get home.

After brimming it, the computer declared a range of 620 miles.
I presumed the figure was based on previous mpg and fuel level. 
I then proceeded at 75mph on the motorway for some time noticing that the range stayed at 620.

I found this to continue, and only after having driven for 120 miles did it decide that the range would start to decrease. 

740 miles on a tank? I wish.  Actual figures put it closer to 560 miles with enough left to find a fuel station before picking up all the real crap in the bottom of the tank.

Anyone else had a similar experience?


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[macca]

my '05 diesel when full stays indicating 999 km even after driving some times as much as 250 km

but then if im super careful i have seen 1200km from a tank

[ChrisLux]

OBC takes level of fuel and current MPG normally .
Must say mine is relatively accurate on both MPG and remaining distance .

If I do a long drive back to UK as in Aug then when I fill up mine will go 999 KM (which is i think highest reading)
then after I've filled up and reset MPG after 1-200 KM will start to tick down .

My Missus did a refill in UK and remaining distance was down to 9 KM on OBC after yellow light been on ages
and when we refilled got just over 90 Litres in to tank .

It is possible to change the parameters of the OBC by going into the service menu , but I'm not 100% sure on how you work out which way to change it now . I saw a friend do it to his when it kept showing far to
generous MPG and he got it down to showing within 0.5 MPG after altering the feed characteristics

[Jamee]

Over 500 miles on a full tank??!!???... i wish.
I have stuck £145 in my 3.0d over the last month and have just managed to get 500 miles, and thats driving normal, no stupid driving on a bypass doing 60-70mph to work and then home, all in about 20 miles a day then just the odd trip to the shops etc.. I have always thought mine is broken somewhere as I thought it would do more than that being a diesel.

[ChrisLux]

Strange  :blink: ???

Even on our local school trip the Missus is getting 28/29 MPG (and she's got boots of lead!!) and we never
get less than 800 KM from a tank and normally quite a bit more , on average 850/875 KM so 530/550 Miles .

On trips back to UK we've had over 1000 KM from a tank , the most was 1250 KM (777 Miles) and OBC was
showing just over 40 MPG .

Maybe because I've had mine re-mapped and it's got more torque it's better ??

[macca]

my best economy is travelling around 100-110kmph

if im doing stop start town driving it can drop significantly

my overall economy for the last 3 years is 8.1 litres per 100

[ChrisLux]

[quote="macca"]
my best economy is travelling around 100-110kmph

if im doing stop start town driving it can drop significantly

my overall economy for the last 3 years is 8.1 litres per 100
[/quote]

Not bad , mine is 9.1 litre/100 for this year's average coz most of time it's used for the 'school' run .