NewNiceMrMe Posted August 16, 2005 Report Share Posted August 16, 2005 BMW are doing themselves a diservice. The fuel consumption on my 645 is incredible - as in surprisingly good. It's fair to say that with less than 1,000 miles on the clock the engine is still tight and I'm sure it'll improve further too. However, it's averaging 22.7 - only 1.2 miles per gallon less then the M3 did. That's quite staggering. The runs it has been on are not totally comparable but individual readings taken on the second mpg count on the car has shown the average to be 22.3 on what could be classed as urban travel. The figures BMW show are less than this - quite a bit less too. I gave it a fair amount of stick around a few country lanes earlier today too, in Drive Sport mode with with Sport button engaged too, and yet it's still recorded 20.7 mpg (when I say 'stick', I mean I was hoofing it....). Possible linked Google search keywords: 95, 98, RON, octane, petrol, combined, cycle, ci, convertible, coupe, optimax, ultimate, bp, shell, tank, capacity. Link to comment Share on other sites More sharing options...
MOSE Posted August 16, 2005 Report Share Posted August 16, 2005 I find that damn impressive considering its a 4ltr V8. Last time I was in the M3, some time last tuesday, mpg was at 24.8, which is the best it has ever been. Link to comment Share on other sites More sharing options...
RS4_Barry Posted August 19, 2005 Report Share Posted August 19, 2005 I find bmw's printed fuel economy to be a little on the high side - 535d is supposed to be around the 35mpg - i'm getting 27 although I do "drive" the car Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted August 26, 2005 Author Report Share Posted August 26, 2005 I'm very surprised at that. Every BMW I/or the wife have ever had has returned MUCH better fuel economy than their combined figures state. Mine certainly aren't driven gently either, and she's not the most conservative driver in the world! You need to get the superglue off the right foot maybe? Link to comment Share on other sites More sharing options...
Golfer Posted November 12, 2005 Report Share Posted November 12, 2005 [ QUOTE ] I find bmw's printed fuel economy to be a little on the high side - 535d is supposed to be around the 35mpg - i'm getting 27 although I do "drive" the car [/ QUOTE ] I also found the 535d to be UNeconomical 27MPG after a week of use, put me off the car coupled to noisey engine around town. Link to comment Share on other sites More sharing options...
MOSE Posted November 12, 2005 Report Share Posted November 12, 2005 The Monaro has levelled out now with a steady 23/24 mpg. This drops around town to about 19.3, but am well chuffed with the 23 I am getting on longer journeys Link to comment Share on other sites More sharing options...
gizze Posted November 14, 2005 Report Share Posted November 14, 2005 I have always found BMWs to be around the urban figure they quote, even with a mixture of driving. I have found it hard to get them to reach the combined figure let alone the extra urban figure. My dads friends 645 coupe is showing 17mpg on his computer. Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted November 14, 2005 Author Report Share Posted November 14, 2005 [ QUOTE ] My dads friends 645 coupe is showing 17mpg on his computer. [/ QUOTE ] Hmm, well my experience has been very different. Perhaps my driving cycle represents the combined cycle to perfection though because I have always hit almost exactly what they forecast in that area. I do have a few key rules though.... 1. Never accelerate HARD when the oil temp is below 70. 2. Stick to non-Sport mode unless using Manual shifting (makes a huge difference) 3. Keep a decent distance and avoid lots of braking with lots of resulting need to accelerate again afterwards - i.e smooth running instead. Then again, every weekend, thrash the knackers off it on a country lane and ruin all your work. Link to comment Share on other sites More sharing options...
gizze Posted November 14, 2005 Report Share Posted November 14, 2005 Also he says that his driving is combinded, but my old man reckons he has probably never been on single journey out of Norfolk in it! I saw a coupe the same colour as yours tonight, have to say I wasn't 100% confinced, but after seeing it I think it looks awesome. Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted November 14, 2005 Author Report Share Posted November 14, 2005 Aye, I'm pleased with the colour and I'm delighted with my choice of the Convertible. If you didn't see the button...you wouldn't know it was a convertible from inside...oh, except when the hood is down, and oh, except for the different rear screen, oh, and except for the different headlining, oh, and ermmm. Seriously though, I'm delighted with it. 3 months in, an M6 turned down (albeit partly to do with the wife and moving house!), and I've no intention of changing. That's a record for me.... Link to comment Share on other sites More sharing options...
loddrik Posted November 14, 2005 Report Share Posted November 14, 2005 I'm lucky to have better than 21 on the DIS in the Alpina, and I don't 'hoof' it much these days. Link to comment Share on other sites More sharing options...
Golfer Posted November 17, 2005 Report Share Posted November 17, 2005 [ QUOTE ] Also he says that his driving is combinded, but my old man reckons he has probably never been on single journey out of Norfolk in it! I saw a coupe the same colour as yours tonight, have to say I wasn't 100% confinced, but after seeing it I think it looks awesome. [/ QUOTE ] Hi where in norfolk are you?, i'm in Attleborough. Link to comment Share on other sites More sharing options...
gizze Posted November 18, 2005 Report Share Posted November 18, 2005 I bet he is in Burnham Market or Blakeney?? I am in Wymondham by the way audijohn, small world! Link to comment Share on other sites More sharing options...
Golfer Posted November 18, 2005 Report Share Posted November 18, 2005 MrME, I never like BMW's BUT I make an exception with yours, If I buy one it will be one of yours, best regards AJ Link to comment Share on other sites More sharing options...
Bungle Posted November 26, 2005 Report Share Posted November 26, 2005 Ive just sold an e39 540i auto (same 4.4 v8 lump in a lower state of tune) and that was very good also. 30 on a run, 22 around town. My overall average was around 27. Not bad for nearly 300 hp. The great thing about big engines is that they are so unstressed, when driven gently, they can be quite economcal. But then of course when you open them up...... Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted November 26, 2005 Author Report Share Posted November 26, 2005 That's not my understanding of the 645 V8. The E39 540i's used an identical sized engine, but the technology within the engines is different. E39 4398cc engines were the M62B44 lump, which I think developed 286bhp under the Bosch ME5.2 engine management system. However, the 645 uses the engine from the 745. That is the N62B44. As you can tell by the letter suffix the engine was given a new name because I believe it used the new Valvetronic butterly system and certainly uses the new Bosch ME9.2 engine management system. The core lump might be the same but much of the components on/around it were changed. I think the 4.4 V8 that was in the E39 540i was identical to that used in the E38 740i and the E31 840Ci. The last incarnation of it was in the E53 X5 in 1998. It was then changed slightly again when it was bored out to 4.6 litres for the 2001 X5 (putting out 347bhp by then). Interestingly though, 1998 model engines (540i) developed 20lbs more torque than the 1996 models and at 300 revs earlier in the range (3,600 as opposed to 3,900) - and BMW didn't really publish the fact. Link to comment Share on other sites More sharing options...
Golfer Posted December 2, 2005 Report Share Posted December 2, 2005 MrMe, What's your fuel consumption like now?, I am thinking of going for a test drive in one like yours. AJ Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted December 2, 2005 Author Report Share Posted December 2, 2005 Well a recent software update and need to reset the service interval counter meant that the computer had to be reset (bugger!). Since then, the car has only been out twice and one of those occasions was on the TSN/BMW Car Club run to Holy Island....and those that came back on the Northumberland Coastal Route will know we had a very 'spirited' drive back once we were clear of a coach on the back roads. It might be that certain figures of well into 3 digits were recorded on a dual carriageway coming back too. I couldn't comment on that and am just going on hearsay, of course... So it's now showing 21.8, a drop of about a mile per gallon - which I think is actually very good considering the style of driving that has been measured on!!!! The only complaint I have about fuel is that the tank should be bigger. It's the same as my A4 to fill up, at £60-ish, yet of course it does less than half the mileage on a full tank! Link to comment Share on other sites More sharing options...
Golfer Posted December 15, 2005 Report Share Posted December 15, 2005 MrMe, whats your fuel consumption like now? and did you read my reply about the 645ci? AJ Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted December 15, 2005 Author Report Share Posted December 15, 2005 AJ, yes, saw the 645 information - thanks for that. The consumption is very deceptive right now because I've had a week of being stuck in very heavy traffic jams (taking 90 minutes to cover a 32 mile trip every day). The average speed is showing as 26 mph so that tells you how bad it's been. On that basis, it's showing 19.7mpg right now (over a 300-400 mile range of measurement). I know for certain it'll rise once the Christmas traffic disappears and things get back to normal, and I expect it to settle around the 22mpg mark. Link to comment Share on other sites More sharing options...
Golfer Posted December 15, 2005 Report Share Posted December 15, 2005 Nice one MrMe, I am going back to have another look after christmas at the 650/645. Best regards AJ Link to comment Share on other sites More sharing options...
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