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Motorways Trial New Speed Limit As Nearly Half Exceed 70 MPH
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loadswine
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PostPosted: Sat Mar 24, 2012 9:01 am    Post subject: Reply with quote

Its not the speed that is the problem on motorways, but the way people behave. Lane discipline is simply appalling and I think this causes more problems than speeding. I wonder how many of the people who complain about excessive speed are actually the ones sitting in that middle lane passing nothing!

My real worry on a higher speed limit are cars out there, not properly maintained as money gets ever tighter. Hopefully the monstrous cost of fuel will slow those folks down. I doubt if I'd want to go much faster than the current limit as fuel is just so expensive.
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DennisN
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PostPosted: Sat Mar 24, 2012 9:31 am    Post subject: Reply with quote

My local garage diesel price is currently £144.9. From my records, 28th March 2007 it was 91.9p.

The only answer for me is to hold back on my speed. But I wonder how many of today's speed merchants understand what it's costing them?
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Oldboy
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PostPosted: Sat Mar 24, 2012 10:27 am    Post subject: Reply with quote

DennisN wrote:
But I wonder how many of today's speed merchants understand what it's costing them?
More speed equates to more petrol per mile equates to more money, via petrol tax, going into Government Funds. Idea
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Tim Buxton
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PostPosted: Sat Mar 24, 2012 10:55 am    Post subject: Reply with quote

DennisN wrote:
My local garage diesel price is currently £144.9. From my records, 28th March 2007 it was 91.9p.?


£144.9? I'd buy from somewhere else. Cool
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AliOnHols
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PostPosted: Sat Mar 24, 2012 12:17 pm    Post subject: Reply with quote

DennisN wrote:
My local garage diesel price is currently £144.9. From my records, 28th March 2007 it was 91.9p.
As the holiday season is arriving, in case anybody is curious to know:- current average prices in this part of Spain are €1.40/L - diesel, €1.50/L - 95Petrol & €1.60/L - 98Petrol although they do seem to be rising daily. 4-5 years ago prices were about 65 - 70 cents per litre!

DennisN wrote:
The only answer for me is to hold back on my speed. But I wonder how many of today's speed merchants understand what it's costing them?
I remember reading years & years ago that your car is most efficient when the engine is running when maximum torque is produced but I could never get my head around whether it was better to be in 3rd at max torque or in 5th at (say)20% rpm below max torque so I resorted to plodding along at a sensible speed and coasting (not free-wheeling) wherever possible.

Regardless of this, I applied the same fuel economy principle when riding my motorbike. On long journeys l tried to go everywhere at max torque in the highest gear. Result = Fuel economy went straight out of the window and I must have broke every speed limit in the book as I clung on for dear life. I think that there must be different formulas for motorbikes.
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DennisN
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PostPosted: Sat Mar 24, 2012 4:14 pm    Post subject: Reply with quote

Tim Buxton wrote:
DennisN wrote:
My local garage diesel price is currently £144.9. From my records, 28th March 2007 it was 91.9p.?
£144.9? I'd buy from somewhere else.


Dammit Tim!! I've just twigged it, after drafting a long, thoroughly reasoned condemnation of you for not being up to date with fuel prices, compared to me, a totally with-it whitevanman of intelligence and handsomeness. Approximately. Evil or Very Mad
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Andy_P
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PostPosted: Sun Mar 25, 2012 12:04 am    Post subject: Reply with quote

AliOnHols wrote:
I remember reading years & years ago that your car is most efficient when the engine is running when maximum torque is produced but I could never get my head around whether it was better to be in 3rd at max torque or in 5th at (say)20% rpm below max torque so I resorted to plodding along at a sensible speed and coasting (not free-wheeling) wherever possible.


Out of interest, how do you know when your engine is working at max. torque? Do you have to look it up in the specs and compare it to a certain RPM for each gear?
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PostPosted: Sun Mar 25, 2012 2:45 am    Post subject: Reply with quote

The REAL meaning of 80-MPH

http://www.mostwatchedtoday.com/the-real-meaning-of-mph/ Very Happy
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AliOnHols
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PostPosted: Sun Mar 25, 2012 7:28 am    Post subject: Reply with quote

Andy_P wrote:
..Out of interest, how do you know when your engine is working at max. torque? Do you have to look it up in the specs and compare it to a certain RPM for each gear?
Hi Andy_P, yes. Quite boring really, just look it up in the handbook for the car, a Haynes or OnLine. If you are lucky enough to have a rev counter fitted try to drive to that. If no rev counter you'll also have to look up gear ratios and final drive ratio and do some number crunching. I'd love to see Chelsea Logan from your video clip try to work that that out!

"In the Old Days" car manufacturers used to have to publish the MPG figures at something like 30, 56 & 70mph and I rather cynically believe that they used to tune their top-gear ratio to be most efficient at 56mph so as to look good against the competition. So, a rule of thumb, drive at 56mph in top gear (where legally possible of course) and you should return a decent MPG.

N.B. The above is from AliOnHols' guide to life based on myths, legends and OldWivesTales. So probably complete bunk.

EDIT -This Statement Retracted - see the quote within M8TJT's next post.
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Last edited by AliOnHols on Sun Mar 25, 2012 12:23 pm; edited 2 times in total
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M8TJT
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PostPosted: Sun Mar 25, 2012 10:12 am    Post subject: Reply with quote

AliOnHols wrote:
A very broad generalisation, based upon cars which I have owned, is that Max Torque appears to be between 2200 & 2600 rpm.
Is that for a petrol or diesel engine, or are your mythst etc. good enouh that it makes no difference? Twisted Evil
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PostPosted: Sun Mar 25, 2012 12:16 pm    Post subject: Reply with quote

M8TJT wrote:
Is that for a petrol or diesel engine, or are your mythst etc. good enouh that it makes no difference? Twisted Evil

Doh! My brain hurts! Our current 2.5L diesel is 2500rpm while our 1.6L petrol is ........ 4000 rpm.!!! I'll get my coat Shocked
I'll double & triple check this then probably retract that particular statement in my preceding post.

Edit - Yep! Peugeot Handbook and Internet prove me wrong so statement retracted. For the moment I'm still standing by my max. torque and 56mph theories. Watch this space!
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aj2052
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PostPosted: Mon Mar 26, 2012 1:09 am    Post subject: Reply with quote

Modern cars dont seem to be designed to get the best for consumption purposes, my previous car had both instant and average mpg on different screen settings tried getting best results using instant reading but just went down to silly figures having to avoid creating a jam behind me, found got better mpg by ignore readings, now current car as both instant and average on same screen and the speedo only shows increments in 5 mile segments so cannot really read an accurate speed, mpg instant figures vary so widely between 7mpg and 99 mpg depending on which shoes you are wearing to which way the wind is blowing it hardly gives me enough time to look out of the window to see where i am, only got 250 miles on the clock yet so must learn not to look at the display.
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Kremmen
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PostPosted: Mon Mar 26, 2012 6:37 am    Post subject: Reply with quote

I read an article that stated that at 70mph your using 10% more fuel to cover the same distance as when doing 60mph.

For the last few weeks I've been sitting in with the trucks on the M25 doing circa 56 to 60 mph and my weekly mpg has risen from just under 38mpg to just over 42mpg.

I only do 10 miles on the motorway each way so it's only losing me a few minutes. I'm also finding it far more relaxing just poodling along.

I top up every week and It's costing me less now than a few months ago even though prices have risen Smile
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Tim Buxton
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PostPosted: Mon Mar 26, 2012 8:14 am    Post subject: Reply with quote

DennisN wrote:

Dammit Tim!!

Sorry, but it just had to be done.
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DennisN
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PostPosted: Tue Mar 27, 2012 7:32 am    Post subject: Reply with quote

Kremmen wrote:
I read an article that stated that at 70mph your using 10% more fuel to cover the same distance as when doing 60mph.

For the last few weeks I've been sitting in with the trucks on the M25 doing circa 56 to 60 mph and my weekly mpg has risen from just under 38mpg to just over 42mpg.

When I thrash my van - that's trying to push at 69mph as indicated by my satnav - my fuel economy goes down to 48mpg if I do it for long enough (a tankfull, 500 miles or so). If I do my preferred speed - 60mph on the speedo, 56/57 on the satnav - I get over 60mpg. I did 1600 miles last week, so those figures make steady driving a sensible option. And, as you say, far more relaxing than tensing everything to charge along!
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