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Post by Martin on Apr 17, 2019 10:07:19 GMT
Even my Eco Hugger Merc only gets 38-40MPG...... I can get 30mpg out of the 911 when driven on a run....save the planet and all switch to 750s  Sounds like a good plan to me! A relative light weight thanks to the carbon core, gearing than means it’s only doing 1,600rpm at 75mph and good aerodynamics means that it’s very efficient on the motorway. Still some one way off a 730d, but the other benefits far outweigh the extra fuel consumption imo. |
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Post by Tim on Apr 17, 2019 10:25:26 GMT
Why am I wasting my time in a 2 litre diesel! That's very impressive Martin. Overall average is around 32mpg, as it drops considerably when you use all the horses. It’s easy to have a 30mpg journey, but that’s just as impressive in its own way. You must be getting an average starting with a 5? Nope. I reset the trip at the last service about 13k ago and its currently at 48.1, which is a real 46ish. A lot of my mileage is commuting at 40-60mph with a couple of bursts if possible and looking at the journey computer for these trips its usually around 48. We got 49 going down to Cambridge with a 63mph average. Both the E46 estates we had did over 50, even in winter on snow tyres. I foolishly thought the improvements in tech would've overcome any deficiencies caused by 4wd. |
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Post by Martin on Apr 17, 2019 11:05:41 GMT
My Dad gets better mpg than that in his new 630d, to be fair it’s not used for short journeys but it’s over 10mpg better than he used to get from his previous shape 525d estate, which had the detuned 530d engine not the later 4 pot.
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Post by johnc on Apr 17, 2019 11:25:07 GMT
Very impressive Martin.
I'd need to drive even slower than Miss Daisie to get those kinds of figure.
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Post by bryan on Apr 17, 2019 11:35:05 GMT
And your still running in John......
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Post by johnc on Apr 17, 2019 12:05:58 GMT
And your still running in John...... Yes. Up to 700 miles so that's 500 to go! |
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Post by PG on Apr 17, 2019 12:16:40 GMT
Very impressive Martin. I'd need to drive even slower than Miss Daisie to get those kinds of figure. In the XFR I view anything over 26mpg on the trip computer as good economy. At the other end of the spectrum, here was my average economy for the first 2 miles in the Shogun yesterday morning, towing a livestock trailer from a cold start.  Yes, that's 3.5. Not 35. |
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Post by Martin on Apr 17, 2019 13:07:43 GMT
Very impressive Martin. I'd need to drive even slower than Miss Daisie to get those kinds of figure. Interesting how different they are, as they weigh a similar amount and aren’t too different in size. Assume the gearing in top gear is similar? |
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Post by johnc on Apr 17, 2019 13:31:57 GMT
Very impressive Martin. I'd need to drive even slower than Miss Daisie to get those kinds of figure. Interesting how different they are, as they weigh a similar amount and aren’t too different in size. Assume the gearing in top gear is similar? Top gear at c75mph is about 1800rpm so not as highly geared as yours. It might just be a slightly tight new engine but it was doing mid 30's on an A road run where I just cruised along. It seems to be settling in to 28mpg at motorway speeds and is showing an average of 25.4mpg which I reckon is pretty good. However I can't conceive of any road conditions that would allow the car to achieve something starting with a 4 whilst maintaining any kind of decent progress. |
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Post by Martin on Apr 17, 2019 14:39:41 GMT
Interesting how different they are, as they weigh a similar amount and aren’t too different in size. Assume the gearing in top gear is similar? Top gear at c75mph is about 1800rpm so not as highly geared as yours. It might just be a slightly tight new engine but it was doing mid 30's on an A road run where I just cruised along. It seems to be settling in to 28mpg at motorway speeds and is showing an average of 25.4mpg which I reckon is pretty good. However I can't conceive of any road conditions that would allow the car to achieve something starting with a 4 whilst maintaining any kind of decent progress. Mine does mid 30s on an A Road run, so it’s the motorway that’s the biggest difference. The gearing will help, along with the suspension dropping and maybe it’s a bit more slippery. Whatever the difference, I was expecting 25mpg from mine and think an average around that number for a 600hp 4WD 4 door saloon is excellent. |
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Post by Tim on Apr 17, 2019 15:25:16 GMT
Top gear at c75mph is about 1800rpm so not as highly geared as yours. It might just be a slightly tight new engine but it was doing mid 30's on an A road run where I just cruised along. It seems to be settling in to 28mpg at motorway speeds and is showing an average of 25.4mpg which I reckon is pretty good. However I can't conceive of any road conditions that would allow the car to achieve something starting with a 4 whilst maintaining any kind of decent progress. Mine does mid 30s on an A Road run, so it’s the motorway that’s the biggest difference. The gearing will help, along with the suspension dropping and maybe it’s a bit more slippery. Whatever the difference, I was expecting 25mpg from mine and think an average around that number for a 600hp 4WD 4 door saloon is excellent. You see, there IS progress. My 18 year old, 400BHP, 2wd M5 gets around 25-26 mpg in normal use and it looks like that's what John will get from a car with additional drivetrain drag and an extra 200BHP. Clearly the tech advances have all been made on petrol engines alone. |
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Post by Deleted on Apr 17, 2019 15:54:21 GMT
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Post by ChrisM on Apr 17, 2019 16:54:51 GMT
My top gear is rubbish. I think 70-75 mph equals around 2,400 rpm Yes but you're not driving around in a barge designed for motorway driving, hence the "inappropriate" gearing in top. Surely you have the performance that you want, but this comes at the expense of high-geared relaxing cruising |
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Post by Martin on Apr 17, 2019 17:28:47 GMT
My top gear is rubbish. I think 70-75 mph equals around 2,400 rpm Yes but you're not driving around in a barge designed for motorway driving, hence the "inappropriate" gearing in top. Surely you have the performance that you want, but this comes at the expense of high-geared relaxing cruising Barge?   |
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Post by racingteatray on Dec 23, 2019 13:53:41 GMT
Was quite impressed with this range read-out when I filled up the car last week!  |
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Post by johnc on Jan 8, 2020 19:29:44 GMT
I have noticed my average consumption drop a bit (22.5 down to 20.1) over the past 2 cold months so I have been doing some investigation.
I have checked my trips to work and home again and the car is getting between 24 and 26mpg depending on traffic. I had an 80 mile run today with a bit of 30/40mph, about 20 miles of dual carriageway and the rest was A road where I enjoyed myself, including a climb up a dead straight but steep hill away from a junction - the car felt like it wanted to fly. Anyway, I got 28.9mpg for that trip. The one other trip I do regularly, is to the post office which is about 1.3 miles of uphill with a cold engine, waiting at lights (where stop start doesn't kick in, in winter) and then the same lights on the way back and a bit of a downhill run - I have measured this trip 4 times now and it is an atrocious 12mpg at worst and 15mpg at best. I think I need someone else to do that trip!
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Post by Tim on Jan 9, 2020 14:22:16 GMT
The winter tyres will be adding some part of the drop in economy.
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Post by racingteatray on Jan 9, 2020 19:38:44 GMT
I was doing some rough back of the envelope calculations for our drive to Italy and back over Christmas and worked out that over two weeks and 2,512 miles we used approximately 75 gallons of petrol (5 and 3/4 tankfuls), indicating an average MPG for the whole trip of 33.5mpg.
Considering that included lots of local piddling around in Italy while we were there, plus on the way down over an hour on the autobahn where I managed to get the car to an indicated 140mph at one point, that doesn't seem too bad.
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Post by Martin on Jan 9, 2020 20:06:32 GMT
I have noticed my average consumption drop a bit (22.5 down to 20.1) over the past 2 cold months so I have been doing some investigation. I have checked my trips to work and home again and the car is getting between 24 and 26mpg depending on traffic. I had an 80 mile run today with a bit of 30/40mph, about 20 miles of dual carriageway and the rest was A road where I enjoyed myself, including a climb up a dead straight but steep hill away from a junction - the car felt like it wanted to fly. Anyway, I got 28.9mpg for that trip. The one other trip I do regularly, is to the post office which is about 1.3 miles of uphill with a cold engine, waiting at lights (where stop start doesn't kick in, in winter) and then the same lights on the way back and a bit of a downhill run - I have measured this trip 4 times now and it is an atrocious 12mpg at worst and 15mpg at best. I think I need someone else to do that trip! There’s a surprising gap between our cars. I’ve just done 60 miles of mainly motorway but with big towns either end, which dropped the average to 64.something and it managed 39.4mpg. If I did the last trip you mentioned, I’d be surprised if it didn’t manage 20mpg. |
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Post by johnc on Jan 10, 2020 9:07:09 GMT
I have noticed my average consumption drop a bit (22.5 down to 20.1) over the past 2 cold months so I have been doing some investigation. I have checked my trips to work and home again and the car is getting between 24 and 26mpg depending on traffic. I had an 80 mile run today with a bit of 30/40mph, about 20 miles of dual carriageway and the rest was A road where I enjoyed myself, including a climb up a dead straight but steep hill away from a junction - the car felt like it wanted to fly. Anyway, I got 28.9mpg for that trip. The one other trip I do regularly, is to the post office which is about 1.3 miles of uphill with a cold engine, waiting at lights (where stop start doesn't kick in, in winter) and then the same lights on the way back and a bit of a downhill run - I have measured this trip 4 times now and it is an atrocious 12mpg at worst and 15mpg at best. I think I need someone else to do that trip! There’s a surprising gap between our cars. I’ve just done 60 miles of mainly motorway but with big towns either end, which dropped the average to 64.something and it managed 39.4mpg. If I did the last trip you mentioned, I’d be surprised if it didn’t manage 20mpg. It appears that the consumption plummets when I am in crawl along traffic, stopping at lights and in the first 2 miles or so when the electronic choke must be sloshing the fuel in. Apart from that I am quite happy. The trip on which I got 28.9mpg included some spirited driving on twisties and at least 3 full bore acceleration runs away from roundabouts/junctions. I don't do a high mileage at all these days so it isn't an issue. However your car's consumption figures are exceptional and very impressive. |
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Post by racingteatray on Jan 10, 2020 10:27:23 GMT
When I was crawling in traffic in my E60 M5, it used to indicate 7mpg! And apparently that was because the computer couldn't measure below 7mpg!
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Post by racingteatray on Mar 20, 2020 14:30:56 GMT
Economy in this car just gets better. This is the current readout and I’ve done 70 miles since last filling the car up (admittedly a good 40 of which was at a cruise-controlled 50mph in the roadworks on the M4.  |
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Post by Tim on Mar 20, 2020 15:58:11 GMT
That's impressive, I see similar numbers on my 2 litre diesel.
Do you know how big your tank is?
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Post by johnc on Mar 20, 2020 18:25:21 GMT
Economy in this car just gets better. This is the current readout and I’ve done 70 miles since last filling the car up (admittedly a good 40 of which was at a cruise-controlled 50mph in the roadworks on the M4. That is very impressive - was it all downhill with a tailwind? I'm keeping my figures well and truly hidden. |
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Post by Martin on Mar 20, 2020 18:54:07 GMT
Economy in this car just gets better. This is the current readout and I’ve done 70 miles since last filling the car up (admittedly a good 40 of which was at a cruise-controlled 50mph in the roadworks on the M4. I'm keeping my figures well and truly hidden. As everyone with a heavy and less efficient 4x4 probably should! |
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Post by ChrisM on Mar 20, 2020 22:15:08 GMT
^
My heavy and less efficient 4x4 is still returning about 42mpg which is about what I expected when I got it
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Post by racingteatray on Mar 20, 2020 22:45:56 GMT
That's impressive, I see similar numbers on my 2 litre diesel. Do you know how big your tank is? Should be the same size as yours? 62 litres I think. |
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Post by racingteatray on Mar 20, 2020 22:49:26 GMT
Economy in this car just gets better. This is the current readout and I’ve done 70 miles since last filling the car up (admittedly a good 40 of which was at a cruise-controlled 50mph in the roadworks on the M4. That is very impressive - was it all downhill with a tailwind? I'm keeping my figures well and truly hidden. I brimmed it on Saturday in Southfields, then went to the garden centre by Wandsworth prison and back home to Fulham. Then had driven from London to Newbury, which is around 60 miles. |
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Post by Martin on Jul 9, 2020 11:42:01 GMT
I'm keeping my figures well and truly hidden. As everyone with a heavy and less efficient 4x4 probably should! Not hiding..... Not sharing because they are hugely impressive figures, but they are slightly better than I expected and taking frontal area/weight/engine size into account along with running at 80mph on the motorway, aren't all that bad really. There was a fair stretch of 50mph roadworks, but the the economy through them was barely better than it is as 80mph surprisingly, as it was with the 7. There's a 60mph average speed section on the M6 and it was much better through that than at 50mph. Broken down lorry in the roadworks on the way back which lowered my average speed, but at least I got to use queue assist which worked well.   |
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Post by PG on Jul 9, 2020 12:17:51 GMT
32mpg is still pretty impressive for something with the aerodynamics of a slippery house brick. I'm intrigued that the earth had shrunk on your return trip. Perhaps is is when it cools as the sun goes down.....
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