yes. your fuel gauge is off. get the fuel pump (under the right side rear seat) out and check if the floating thingy is ok (e.g. it shouldn't be bent). If it's not that, its the variable resistor on the floating thingy. Also the floating thingy on the other side needs to be checked.
Hi Nick,
Most I ever got in was about 82litres and had been on reserve for about 30 miles, but no matter how delicately I drive have never managed to get the elusive 400miles out of a tank!!
Cheers
Best ever is 86litres when I had just purchased the vehicle...salespeople...
Ever since the current record is ~82l
Its not clear which engines you guys have, out of interest, whats the average real world range to a tank from a CSi and the 840 (4.4)?
I've managed to squeeze around 87 litres in the tank - almost running on memories!
With a tank full driving normally I've regularly returned 600km to one tank, using cruise control as much as possible I improved this to 740km but since fitting the wider tyres (295 rear/ 245 front) the economy has decreased noticably 
My car is an M73
I know I have put in over 80 liters, but then I have been driving with the warning lamp on for a while.
As for range on one tank, I have never checked.
I did'nt get this car for it's fuel consumption 
My computer tells me I'm averaging 15-16l/100km for my style of mixed driving
Hang on..... I know for a painful fact that I have fitted £100.00 into mine when fuel was getting on for £1.10 /ltr making for at least 90 litres. I'll have the receipt somewhere at work which would show it. Don't think I spilt any on forecourt
Prior to fitting the LSD, I managed to eek over 450miles on a tank driving to Plymouth and back on motorway.
(4.4 1997 840ci)
I think I got 83lts in mine and have a photo of the fuel consumption on the motorway of 23.6mpg 8er.org/forum/index.php?attachment/9579/ anyone got any more from a v12? 
Zitat von Steve5;67525I think I got 83lts in mine and have a photo of the fuel consumption on the motorway of 23.6mpg 8er.org/forum/index.php?attachment/9579/ anyone got any more from a v12?
Yes, I have seen 29mpg which I found very impressive. On the other hand, I've also seen 6 mpg
Zitat von Argonaut;67527Yes, I have seen 29mpg which I found very impressive. On the other hand, I've also seen 6 mpg
That is impressive!
A guy I once knew with an 850 told me he regularly got high 25-30mpg on long runs and said that the consumption noticeably improved, the longer the journey. He couldn't explain it but said he was told that the engine management picks up that you're in cruise mode and cuts half the cylinders!! A great story and one that to this day I have never really known whether 'fiction' or 'fantasy'.
Anybody else heard similar?
fantasy.
Many car manufacturers have experienced with cutting cylinders (an '81 Cadillac Coupe DeVille, for exampe, able to run on 4, 6, or 8 cylinders), including Mercedes. But none have actually continued their research activities. As a matter of fact, cutting injection AND closing the valves perminently would considerably reduce mileage. But the additional cost for the valve-train has never been approved by any car manufacturer.
There are many more interesting concepts but none have made it into serious series production (with the exception of the above mentioned Cadillac).
all in all - mileage will improve simply because oil and fuel sludge build-up is removed (partly) due to the higher temperatures.
When the warning light comes on I work on having 10 litres left, as it usually takes 80 to top up. By the way, on the way back from Le Mans this year we had to pay E1.43 a litre on the payage. Can I claim a record for this? Re MPG, I once did a test on the M6 and at a steady 75mph I eased 32mpg out of the old girl.
What about oil? My M62 did 7K between purchase and the next service and I never needed to top up. I had been warned to expect "some" oil useage, so this was a real result. Is it typical?
similar story here...i got almost 28mpg out of my M62 and roughly 480 miles out of a full tank (around £80 worth) very impressed! and that was mixed driving ( A roads...sitting in north london rush hour M1 traffic...swift motorway driving...etc ).
Zitat von sprucegoose;67562Re MPG, I once did a test on the M6 and at a steady 75mph I eased 32mpg out of the old girl.
Forgot the important bit - that was using Shell 99 Ron. Worth a few extra pennies for the additional power and mpg in my book. Don't put anything else in now unless I have to.
In reading the petrol reports from y'all it's scarey. I know we've all gotten in situations with no gas station anywhere, but these poor fuel pumps.... they're cooled with fuel and not a good idea to run on low regularly.
Zitat von rcrad6653;67642In reading the petrol reports from y'all it's scarey. I know we've all gotten in situations with no gas station anywhere, but these poor fuel pumps.... they're cooled with fuel and not a good idea to run on low regularly.
The pumps are cooled by the fuel going thru them. Not by submersion or they would be damaged every time you went below half a tank and they were uncovered.
Don't worry. Be happy! but don't run out.
For what its worth, I have hit 30mgp on the motorway in my 1997 4.4 (not sure what engine number). But I have to admit it was during a stretch of the M25 where the average speed limit was 50 mph, and my wife was driving.
Speed......
Zitat von Deep;67791For what its worth, I have hit 30mpg on the motorway in my 1997 4.4 (not sure what engine number). But I have to admit it was during a stretch of the M25 where the average speed limit was 50 mph, and my wife was driving.
Now that's interesting.....for I've found the optimum speed for best consumption is 70-80mph (28mpg) but if I drop to below 60mph, the consumtion creeps up (25mpg). On a long long run...say 250 miles, cruising with speedo at High Noon (keeping a good lookout for feds)....I have got 24mpg.
M62 4.4
Trouble is you soon lose it all having fun!
Zitat
Now that's interesting.....for I've found the optimum speed for best consumption is 70-80mph (28mpg) but if I drop to below 60mph, the consumtion creeps up (25mpg). On a long long run...say 250 miles, cruising with speedo at High Noon (keeping a good lookout for feds)....I have got 24mpg.
M62 4.4
Trouble is you soon lose it all having fun!
I would second that !!!
Unfortunately I have my arm in a sling so itching to get back in the drving seat, until then being driven around by my wife.
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