I thought the most fuel efficient way to drive a truck is try to keep it between the engine labouring and racing away irrespective of speed.
DAVE Y:
Cut down to 53mph
Same here, but I do know a way of getting 56 out of it by the flick of a couple of existing standard non illegal switches, but only use it for MY benefit (usually to get parked up in time near a pub 
)
However if I told you how, I’d have to kill you. 
Conor:
Tris:
Mine cruises at 55mph according to the Sat Nav, better than most but I’d like the workshop to winding it up a bit more to 57mph.So you’d save a whole 18 minutes if you did a 9 which wouldn’t really achieve much. Its not going to get you an extra run and if your employer is planning runs so tight you need to find another employer.
On modern trucks I think its only the main dealers who can alter them now.
You really do need to start thinking outside the box nipper. Everything is black and white to you. Let me give you an example; that extra 2mph could give me the edge and enable me to pass a slower truck prior to a roundabout, and I could then effectively gain time over and above your logic on acceleration. Take a road such as the A43 from Northampton to the M40 - a lot of time can be saved/gained on those roundabouts. Maybe it’s not the best example as they can all be taken in lane 2, but you get the point I hope.
ajt:
This argument which crops up about a few minutes doesn’t make a difference is complete garbage.
A few minutes is the difference between making it home on a night and the difference between making a delivery on time. Also the difference between sleeping in a truck stop or a layby!And before anyone says ‘‘down to bad planning’’ - ever driven on the M6 on a weekday?..
We are limited to 52, no idea why because when ever we get a hire truck in which does 56 it actually returns better MPG figures than ours lol - also the ‘‘alleged’’ fuel saving which isn’t, is offset by drivers being out in their trucks for longer, extra night out money and late delivery penalties not to mention it just screws the gearboxes up. A modern truck is designed to cruise at 56mph. Thats what it has been mapped and set up to do. Some spotty enviro doo gooder doesn’t know better than the person building the trucks!
If you’re continually struggling to get home or find a decent place to park, despite knowing how bad the M6 can get, a couple of mph isn’t the problem.
neilg14:
0
Meh, is that it?
I would tell you which single carriageway I’ve done 75 mph on, but the police will probably set up a speed trap there if I did.
115km on cruise 130ish on the pedal.
Obviously you must be salaried, as for us paid by the hour guys whats the problem and by the way the limit under power is 90kmh or 56mph in old money. 
As for the A43 as mentioned, coming from the north and heading for the A34, usually find the M42/M40 is quicker as you don’t have 20 miles of roadworks on the M1 before you get to the A43 turn and when your heavy the roundabouts are a real PITA! 
nope sit at100- 105 all day long but im the slowest quarry truck on the road it seems some days ,my running mate sits at 110km all day long and finishes about an hr before I do.(13hr driving x10km difference) so over a week about $100 better off.
pst avatar on left is actual motor.
ajt:
This argument which crops up about a few minutes doesn’t make a difference is complete garbage.
A few minutes is the difference between making it home on a night and the difference between making a delivery on time. Also the difference between sleeping in a truck stop or a layby!
Find another job. You shouldn’t be run that tight. Currently we’re having at least 30-45 minute delay in BOTH directions running from Howden up to Lockerbie on a night and you can still do it in less than a 9hr drive and only 20-30 minutes over what the total run is normally scheduled for. That’s how stuff should be planned, not planning 8hr 45min driving days and stressing drivers out as they try to do it.
A modern truck is designed to cruise at 56mph. Thats what it has been mapped and set up to do.
No they’re not because limiters are supposed to be calibrated to 85KPH aka 53MPH.
52mph ta very much lol hourly paid and all that more time for legwatch as well.
Got a 64 actros on hire atm goes like stink 56/57 the all knowing computer says it’s giving 10mpg which isn’t too shabby.
JIMBO47:
nope sit at100- 105 all day long but im the slowest quarry truck on the road it seems some days ,my running mate sits at 110km all day long
Sounds like a different lost world of the last days here of night trunking with proper trucks at proper speeds. 
How fast? Well it varies.
Mainly on how heavy the load is and whether im going downhill or not…
Carryfast:
JIMBO47:
nope sit at100- 105 all day long but im the slowest quarry truck on the road it seems some days ,my running mate sits at 110km all day long
Sounds like a different lost world of the last days here of night trunking with proper trucks at proper speeds.
aye CF it was a breath of fresh air ,seemed to take years off me being allowed to drive at a reasonable speed …have to adjust my brakes every few weeks ,better safe than sorry.,even my mate at 110km is made to look slow by some .
I normally do 60-70 on the motorway
alix776:
I normally do 60-70 on the motorway
Still on for Richard King then…
Tris:
Mine cruises at 55mph according to the Sat Nav, better than most but I’d like the workshop to winding it up a bit more to 57mph.
Tell us why you want it to go 2 mph faster,2 mph is going to make very little difference
Olog Hai:
alix776:
I normally do 60-70 on the motorwayStill on for Richard King then…
Firstly no not for about 4-5 years secondly all that companies trucks are legal on the limiter
Carryfast:
JIMBO47:
nope sit at100- 105 all day long but im the slowest quarry truck on the road it seems some days ,my running mate sits at 110km all day long
Sounds like a different lost world of the last days here of night trunking with proper trucks at proper speeds.
This thread is FAF, boasting about doing 57mph!
It used to be that you never had a fast lorry unless it would go off the clock, I had a 1735 Merc that went so fast the mirrors would slam in against the side of the cab about 200rpm after the needle dropped off the end of the taco and it still had more to go lol
The speedo in my Peterbilt went to 100mph and I had that off the clock a few times too [emoji41]
Conor:
ajt:
This argument which crops up about a few minutes doesn’t make a difference is complete garbage.
A few minutes is the difference between making it home on a night and the difference between making a delivery on time. Also the difference between sleeping in a truck stop or a layby!Find another job. You shouldn’t be run that tight. Currently we’re having at least 30-45 minute delay in BOTH directions running from Howden up to Lockerbie on a night and you can still do it in less than a 9hr drive and only 20-30 minutes over what the total run is normally scheduled for. That’s how stuff should be planned, not planning 8hr 45min driving days and stressing drivers out as they try to do it.
A modern truck is designed to cruise at 56mph. Thats what it has been mapped and set up to do.
No they’re not because limiters are supposed to be calibrated to 85KPH aka 53MPH.
We don’t do set runs, totally different game to a night trunk.
Trucks are set up to run at 56,. Limited below that and all your doing is killing the power band and running gear.