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mpg-E38

BMW forum 7 Series car: E23, E32, E38, E65, E66, F01

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mpg-E38

Postby BMW Virgin » Wed, 14 Jun 2006 16:49:23 UTC

Anybody know what the normal MPG is for the 740il.

Any help please.

Mine seems to be consuming a lot of fuel.

Cheers.
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Postby scorcher » Wed, 14 Jun 2006 18:01:26 UTC

I get 19mpg, doing 70 miles a day, mostly motorway.

But not an iL, just a 740i
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Postby Guest » Wed, 14 Jun 2006 18:42:50 UTC

My father for 25mpg on his 740il. He mostly drove gently, with a little 'fun' time.
I'd expect 23-25mpg if you're reasonably careful, and drive to the roads (i.e. accelerate gently down hills, decelerate gently up them, plan ahead to reduce acceleration and braking time etc)
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mpg

Postby arvi » Thu, 15 Jun 2006 08:47:42 UTC

i get from an 1999 740 4.4

hard driving in town 18-19mpg

normal 19-21mpg

motoway fast 25-27mpg

motorway 70mph 28-30mpg
Also Seen In 740i, 525i, VW Caravelle 2.1, New Beetle 2.0 Auto
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mpg - e38

Postby BMW Virgin » Thu, 15 Jun 2006 09:33:30 UTC

Thanks for your replies guys.

My reading is 15.9 MPG for city driving and not hard driving i might add.

Is this bad or would the consumption gauge be faulty.
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Postby chris735i » Thu, 15 Jun 2006 10:03:55 UTC

Doesn't sound too bad to me. I get 16.9 city driving in my 735i and I don't drive hard at all.
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Postby arvi » Thu, 15 Jun 2006 13:42:50 UTC

ive always found with the bmws i have owned they always run better after a good motorway run and good rev they seem to self clean

try giving it a blast or a bit of redex

also check that the cooling sytem is running fine these cars have variable cooling if running too cold use more fuel

i have a 525i which is over cooling costs more to run than 740
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Postby Guest » Sun, 18 Jun 2006 14:52:03 UTC

^ I second that. If there are no other signs of a problem, just give it an 'italian tune up'.

With engines this big there is a tendency to drive them gently all the time - this isn't necessarily as clever as it sounds. An ideal engine life will include a good mix of gentle and harsh driving, just not toooo much of the latter. ;)
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Postby timbo 1100 » Tue, 20 Jun 2006 17:25:08 UTC

drive them gently!! :lol:
the 750 was showing 18.1 on cons1 (long range) & 21.3 on cons2 (after a couple of long m/way cruises)
so re-set & had a bit of a play & got cons2 down to 12.1 :D
not good for the wallet but boy was it fun :wink:
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Postby dekhelia » Tue, 27 Jun 2006 20:43:39 UTC

735i here, so figures will maybe be less, but: on a trip to germany last week i got 25mpg over 1800 miles. back in town here i get 20mpg with a light throttle, and 13mpg if i want to get around more quickly. on a long run with a light foot, 37+mpg is easily attainable. i've even seen (albeit briefly) 50mpg @ 125mph.
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Postby Guest » Tue, 27 Jun 2006 22:25:37 UTC

dekhelia wrote:on a long run with a light foot, 37+mpg is easily attainable. i've even seen (albeit briefly) 50mpg @ 125mph.


Are you serious? I don't mean to sound rude, but that's pretty much bordering on the unbelievable. Congratulations if you did manage that though!
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Postby dekhelia » Wed, 28 Jun 2006 06:29:23 UTC

well, i was cheating really - it only happened on the overrun (so probably no gas going in at the injectors at all) ... and the road was downhill also. still, it was nice to see the figure so high, even if it was academic as opposed to real. it's a good point about these engines though, that in general they are very economical on a long run. city driving is a killer though :shock:
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Postby Guest » Wed, 28 Jun 2006 08:27:43 UTC

Hehe, ;)

Yea, city driving sucks because they're so damned heavy. That's why low range acceleration isn't that special, but 50-100 is immense. :D
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Postby fjh » Sun, 02 Jul 2006 20:58:39 UTC

My 735 E38 3.5 V8 gives 27-30 mpg shown on instrument light-foot cruising ( at speed) without doing actual fill-up mileage checking.
On overrun of course it reaches ridiculous high figures for a split-second !!
On slower around town I register 24/25 mpg, but stop-start driving at 25-30 mph shows it's awful.
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Postby paul261267 » Mon, 03 Jul 2006 20:26:08 UTC

My '95 740iL averages about 20mpg in town, and about 27mpg on the motorway. The best return I have had so far is on a long drive home from Scotland, it managed 31.7mpg all the way back for 340 miles at a steady cruising speed of 62mph.

On filling up when I got back home it took exactly £48 from half a tank, not bad for such a large engine I reckon.

I have also seen the lower 15's too with "spirited" driving on my local B roads :)
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740il Fuel Consumption

Postby Simon728 » Mon, 03 Jul 2006 21:50:04 UTC

Your fuel consumption does sound a bit heavy even for a 740il. I suggest that this is one of those times when it might be worth booking a diagnostic check at a BMW dealer - it doesn't mean that you have to have any further work done there.
There is a mass air-flow sensor between the air-cleaner and the engine air-intake pipe. If this is faulty you will get high fuel consumption.
Also a faulty temperature sensor in the air-intake manifold can affect fuel consumption.
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So probably I'm the worst then!

Postby LondonThing » Tue, 04 Jul 2006 15:17:33 UTC

So far the lowest is EIGHT MPG. Yes, that's twice 4, half sixteen... from sitting right in the middle of London and waiting in queues a good deal, etc. I see 24 on the computer on a run at 80, which I suppose is a compensation of a sort...

Mine's a 750iL. I suspect it has led a somewhat pampered life and I'm going to try getting it to Germany as soon as those dashed football johnnies get out of my way - I expect a bit of Redex and a few stretches to 155mph might help the whole thing settle down.
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Postby Guest » Tue, 04 Jul 2006 16:14:34 UTC

Quite: I always recommend an Italian tune-up from time to time, especially on that sort of car in a city. It would never need to exceed 3k revs!
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Postby Scania » Sun, 09 Jul 2006 13:49:52 UTC

Can't say how happy this thread has made me with my e38 728i & its average of 28 Mpg ! 8-)
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Postby DevonDeano » Mon, 28 Aug 2006 23:16:57 UTC

MMMMMMMMMM Im returning about the 23mpg around town in my 94 740i. On The B Road from devon to Bristol (M5) im averaging about 37 Mpg which is farr better than my now desceased 520i which would give me around the 30ish mark if the wind was behind me!!!!

Or is it me now ive turned 40 my foot has suddenly lost all the lead weight it once had??

TOGS here i come

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