I have a 07 plates TD4 with 51k on the clock.

I've noticed that if I fill up from empty with siupermarket cheap stuff then my gauge will read 420 ish miles in the tank till empty .... if i fill up with branded diesel plus expensive fuel then it'll say 540 miles in the tank till empty.... I've seen it over the last 4 -5 months. I tend to fill up month about with cheap v expensice diesel....

Am I being thick in thinking that expensive diesel gives you more projected MPG ????

The projected range will be based on the avg mpg at the time of filling up, the trip computer doesn't know how much you paid at the pump

I've noticed a 1.5mpg increase running on shell instead of Tesco's

Edited to correct my iPad spelling

Last edited by npinks on 22nd Nov 2012 10:42 pm. Edited 1 time in total

npinks wrote:

The projected range will be based on the avg mpg at the time of filling up, the trip computer does know how much you paid at the pump

I've noticed a 1.5mpg increase running on shell instead of Tesco's

I suppose how the car burns the diesel will have a small factor in it, but not immediately, only when it's instant mpg is higher over time

npinks wrote:

The projected range will be based on the avg mpg at the time of filling up, the trip computer does know how much you paid at the pump

I've noticed a 1.5mpg increase running on shell instead of Tesco's

How does the trip computer know then, does a little man pop his head out of the tank, says that's dear fuel so you will go further

Now thats funny, nice one

It allso knows when it's traveling south ( downhill) as the average mpg is allways more than when travelling back north ( Uphill)

Toeknee,
It's true
I get much less mpg when I travel up to CG's than i get when i drive 'down' to Cornwall
I also use more fuel when swmbo is in the car as the aircon is pushed to it's limits with all the hot air  Another member of the failed FL2 clutch/DMF club, twice.

the airs tougher in Yorkshire, and we dont like sharing it At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

The car does know what grade of fuel is being used but obviously not the price. I have ran V Power in mine constantly unless I get caught short, which is normally on holiday.

I noticed after putting in half a tank of cheap French supermarket stuff, the mpg dropped by about 4mpg and the car didnt drive as nice. Freelander 2 HSE Lux 2013MY - Barolo Black with Ivory Leather. Alpine DVD - Privacy -Evoque 20" Dynamic Wheels and more to come.........

wiggy wrote:

... siupermarket cheap ... 420 ish miles ... branded diesel ... 540 miles

If there is a case for one being different to another, I would put it down to the 'cetane number' where one is more efficient at combustion than the other requiring less throttle to do the same work.

There, a scientific answer from a budding Einstein, no need for anymore answers

EDIT: this got nothing to do with the original question, just why one may be better than the other in MPG.

Last edited by EYorkshire on 23rd Nov 2012 11:41 am. Edited 1 time in total

the car will monitor the combustion of the fuel, and more expensive fuel will most likely to have better combustion, but when you restart the car after filling up the fuel lines will have cheapo fuel in still and its only driving it that will allow the car to know its running marginally better and from there increase the range in the tank on the display

As far as I know the range is calculated based on the average fuel economy over the last 10 minutes to an hour depending on the car, so if you drove carefully up to the garage then the available range would show more after a fill up than if you drove it like you stole it

Without going off topic, I just filled up at Shell Leamington this morning and put in 67.83 litres. The 'Range' still showed 8 miles before I decided to refuel, and given that it's only supposed to be a 68 litre tank, then something clearly isn't stacking up here. Surely you need some space between the tank and the Diesel that's in it? Or could it be a poorly calibrated Diesel Pump at the garage? Foraging near Gaydon....
——————————————
MY13 HSE Lux SD4, Baltic Blue - current, 30,000> miles without fault
MY12 HSE 2.2 SD4, Sumatra Black - gone after 10 months/43,000 fault-free miles