Don't forget that the cold fuel is pumped from a tank in the ground. The fuel will expand in the car since a diesel has a backflow (?) pipe, that will put excess fuel from the diesel injection unit back in the tank. The fuel in a diesel car will be something about 20 degrees celsius because of this. So when the cold fuel is filled all the way to the top and starts to expand there's a chance you will start leaking diesel fuel.
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Is the opposite bad also? Having a low fuel tank for a long time? There are two low fuel warning screens. One warns you when you reach preserve fuel level, and another one shows a fuel pump symbol.
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They used not to recommend running the tank very low as sediment & rust particles from the tank used to be sucked into the fuel system as the pipe used to come out of the bottom of the tank but nowadays they tend to either take off from the side a little way up from the bottom or make the pipe go up inside the tank a bit. Also some tanks these days are made from types of plastic which gets around the rust issue. You could also get fuel surges going up or down inclines and also on hard cornering. again some tanks have baffles to eliminate this problem. They also dont recommend running a diesel tank 'dry' as you then usually have to manually reprime it.
Best bet fill up as soon at the first low fuel warning.
I now have a bit over 2600 km on my B and the cumulative fiel consumption screen (after reset) which was zeroed when I took delivery, shows 7.3 L/100 km (it just went to 7.3 today, so the actual calculated average is probably 7.34).
My actual fuel usage and km driven return a fuel consumption figure of 7.63 L/100 km.
So at least for my car, the fuel consumption screen seems to be about 4% optimistic, which is fine with me, though I prefer being pleasantly surprised at the pump, a little pessimism is OK too. Anyway, plus or minus 0.3 or is close enough.
To get a really accurate read on this, zero the "after reset" screen at a fill, and leave it, checking actual consumption all the time. After 4-5 tanks, you should get a clear picture of how the accuracy is.
My car has been on winter tires for the entire last tank, so 7.7 (the last tank's result) is a pretty good score, considering that. You can see my FE records by clicking on the icon in my signature.
Don't rely on "after start", unless you are burning an entire tank in one day,
Is it really true? What is the reasoning behind it? I always try to fill as full as possible. I keep filling even after the air pressure stop the pump several times. But no matter how full I try to fill, the "Range" always only show 771 km..
I have the habit of filling at the last moment. I have started the car several times when Range shows below 30km. I fear the car will die on the middle of the street. How much fuel does starting the car need?
How accurate is the Range? I understand that there is a needle in the tank to measure the volume of fuel and show it as km.. It is only accurate when the car is on a flat street.
When I fill up I have 1080KM range, but it quickly becomes 7-800KM
So the problem in filling up for more clicks of the pump stands only on gas, or on Diesels too? I have a Diesel and I like filling up until the very top of the pipe. I hope there's no problem with that.
On the other hand, the manual saids that the reserve fuel consists in 6 liters. This means that I have 6 liters left in the tank from the moment the low fuel waring appears. When this low fuel appears, I select the KM range and first it indicates about 120 KM range, but only after 15-20 KM it will indicate 20-30KM remaining fuel, and shortly after, both the indicator (analogic fuel indicator) goes to 0, and the computer shows 0KM, even if I did not cover a distance as long as burning 2-3-4 liters of fuel. So, I prefer calculating in mind what number of KM I covered since low fuel warning appeard (with those 6 liters) because the computer range KM goes to 0KM too quickly.
Last question, those 6 liters of reserve fuel, are INSIDE the 54 liters specified capacity, or are another 6 liters so we have 60 total capacity?
I did a long term check on the fuel consumption screen over the last 3000 Kms. The car computer shows 10.6L per 100 KM since last reset and initial fill up. Using the total fuel over several tanks I get an actual consumption of 10.79996L per 100 KM.
So in our B the error is only .2L per 100KM or less than 2%, which is very good I think.
Not a record but excellent for city driving in a busy area and mainly short distances.
Bill,
I haven't had my B long enough for a long term check of the computers accuracy; but, your fuel consumption is very reasonable for mainly urban driving.
I drove to Abbotsford airport today, 175 Km return, and the trip consumption was 8.4 liters which was very good considering the trip was in a driving rain storm and we had four people and some luggage. I tend to believe the trip computer is probably very accurate because MB does not want litigation and a black eye ( think Mazda and HP claims.).
on your new ride.
which was very good considering the trip was in a driving rain storm and we had four people and some luggage. I tend to believe the trip computer is probably very accurate because MB does not want litigation and a black eye ( think Mazda and HP claims.).
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