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  Topic Review (Newest First)
01-08-2011 12:56 PM
Olliesgrandad
Quote:
Originally Posted by welshjenni
I am rather perplexed. When I fill up with diesel I always zero my trip switches on my 58 Cmax zetec 1.6 diesel. Over about the last three weeks I got the impression that the 'miles to next fill up' reading seemed to be dropping quickly than usual so at the last time I put some diesel in I made a point of checking the figures. At filling it said that I would need to refill in 121 miles .
It sounds like you are refuelling when you have not covered that many miles. The dealer tells me that when you refuel fluid is injected into the tank from the DPF fluid reservoir.
I was told this because at my 37,000 3 year service they now recharge the DPF filter rather than at 75,000 miles. This is because people are topping up with small amountsof fuel rather than say letting it drop to a quarter of a tank.
I don't understand how it works but I know that when the DPF filter burns off mpg drops during that period.
Try letting your fuel level drop to a quarter and then refuel and see what happens.
When Irefuel usually after abut 380 milesmy miles to empty is around about 570 on the trip.
01-08-2011 02:39 AM
MetalMicky08 I always take these reading as approx.MM



01-08-2011 01:01 AM
Mark_W Its funny I had a chat with my mate down the dealers today he's a workshop manager and we were talking about the MPG reading & how far till you run out of fuel reading etc in the Ford cars. I think romseyraver said the right word, the MPG reading and other reading on the onboard computer is a gizmo, and is not accurate. They are there to give you a (that word I don't like) an approximate ready.<?: prefix = o ns = "urn:schemas-microsoft-comfficeffice" />
It like when the reading says you got 25 mile till your run out, everyone knows you could go longer than that. So this gismo is there as a guide.
12-16-2010 09:54 PM
romseyraver I don't have anything as sophisticated as 'miles to next fill-up' on my car, [img]smileys/smiley6.gif[/img]but a neighbour has a Toyota Avensis diesel with something similar. It is inaccurate, to say the least, and not really worth taking any notice of. I think Shaz is right, however, and that the least inaccurate measurement is obtained on these gizmos by not resetting and allowing them to calculate over a longer period rather than resetting them at each fill-up.
12-16-2010 07:32 PM
shaz I dont know but I presume that they dont have an expensive flow meter so the computer has to use two inputs 1 is the amount of fuel in the tank and the 2nd is the miles run. As the level drops it computes mpg by seeing how far its run it then displays this figure and works out how far you can go on whats left. If you fill up without resetting it uses the last mpg and the new fuel level to work out a new miles to go until empty. If your driving is much the same all the time your mpg should stay the same if you dont reset. If you reset, the accuracy of the mpg and distance left in the tank will take time to settle and looking at your numbers you are running with only a few gallons in the tank and the lower the numbers the greater the error. Just my thoughts, might be wrong but try not resetting each time.

Ed
12-16-2010 03:09 PM
welshjenni I am rather perplexed. When I fill up with diesel I always zero my trip switches on my 58 Cmax zetec 1.6 diesel. Over about the last three weeks I got the impression that the 'miles to next fill up' reading seemed to be dropping quickly than usual so at the last time I put some diesel in I made a point of checking the figures. At filling it said that I would need to refill in 121 miles . After 40 miles it said I would need to refill after 60 miles - what happened to the other 20 miles worth?? Until now the trip switch has always been pretty accurate - my driving patterns haven't altered - mostly local running about - . Can the cold weather affect consumption?

I realise that my trip switch may be faulty but it does seem to be backed up by the actual tank guage.

Any suggestions.

Thanks


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