You can fill your diesel to the brim without any problem.
The 6 L "reserve" is part of the 54 L. I have been getting pretty good numbers on the range, up to 900 when driving with a full tank on the highway.
Sorry to resurrect an older part of this post, but I was pondering this today and did a search - Mike, are you sure the 6L reserve is part of the 54L? I filled up today when the warning came on and put in 53L. I checked my last receipt and find it was 53.8L - very close to 54. These numbers make me think that the total capacity is 60L - 54 L + 6 reserve. Am I wrong?
Officially the total is 54 L, of which 48 is non-reserve. You can get more in, especially if the car is on a slope when filling (sloping away from the pump and down to the front. You don't want to overfill the gas tank though as it would totally ruin the anti-evaporative fuel vapour canister.
The guy in Germany with the B 200 is, I am #2 and you are not in the competition because the on board computer is inaccurate! Relying on it is self-delusion. I found this same margin of error (about 5-7% optimistic) in the C 230 K we drove across Canada in duiring 2004. And that one did not get zeroed on the way, though it spontaneously zeroed itself at about 10,000 km (which I assumed they all did, but that was in hindsight probably a glitch, of which that car had a few).
When I'm at 7.50 at spritmonitor, my After Reset Screen would have shown 7.0 or 7.1. This is based upon the error noted during 12,000 km of actual field results.
The ski trip average wasn't 8.5, it was that in one direction, and in the low 7s on the way home. The 5.5 hours of idling tank, I've not included in the overall figure, but I will add it soon.
At refill time for the past 10 or so fills, the After Reset screen has usually shown under 7.0 L/100 km, sometimes between 6.4 and 6.9. I only started recording this at 5000 km; I can take photos of the screen at refill time, if you like.
It's more meaningful to zero it every time, so you know what your average speed over the fill was, as well as being able to verify the inaccuracy of the OBC.
Derek, until all of your fuel receipts are entered into a spreadsheet, you are not in the game. Come on buddy, get with the program!
Thanks, Mike, but how do you explain my getting 53-54 L in the tank when the light has just come on? You use the word "officially" - do you think the tank is actually bigger? Gas stations are pretty level! Do you get that much in on your fills according to receipts?
Derek - Mike's thrown down the gauntlet -time to start saving those receipts!
Gas stations are pretty level! Do you get that much in on your fills according to receipts?
mmm, I've always asked myself this question ... HOW accurate are their tanks when pumping ... ??
The most that I've put in mine is 52L, and I remember my girlfriend freaking out cause the light was on and a message appear in the cluster ... I guest you can't do that good old "out of gas, stuck alone with me darling" trick with my B ...
I guess the tank is about 55 L but the filler neck is long and if the fuel fills it to any extent, that could add a few L. But as I said, it's dangerous because the charcoal canister could be damaged. Maybe the fuel cutoff on the pump nozzle you were using was not calibrated sensitively enough.
I checked the On Board Computer results that I have recorded on my car, and the mean value over the past ~7000 km (since I've been recording the OBC value at fill time) is 6.9 L/100 km, so chances are that my After Reset screen would be reading 6.9, 7.0 or at the absolute most, 7.1 if I had never reset it.
I also went through the fills I've done with OBC results recorded (again, 8000 km and rising) and found that there is exactly a 0.4 L/100 km optimism to the OBC reading.
You can check this for yourself by clicking on my fuel economy logo for the B 200 in the signature line. The OBC result is shown in the right-most column, under "BC", which will show the result if you hover your cursor over it.
You're right Mike! I'm not in the game. Life is too short.
Let's play my game for 6 months and not reset the "inaccurate" B fuel estimator. Cheers, Derek
Life is too short. 
and not reset the "inaccurate" B fuel estimator.
Cheers, Derek
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