9+ MPG Class 8 5 Axel Trucks with Trailers

never mind, found it.

 

600 k before rebuilds? Let me guess: DAF? they usually die at the magic 600k mark, I had 2 and both died well before that, I won't go into that now, I'll stick with the v8 Scanias , no egr crap on them, that's what's causing most of the issues with modern engines! As riverstick once quoted here " u cant expect a top athlete to perform while inhaling his own farts" We're not having any issues with them at all, I know Russian fuel is a problem But in fairness there's more twigs and mud in their diesel than there is diesel !

The problem is unless u have a super efficient truck here u can't compete, diesel in Ireland is now 1.65 euro p/l at the pump , it's far more expensive than let's say belguim or Luxembourg , I had a lovely 144 530 v8 but I had to change to a 164 580 because there was 2mpgs of a difference between the newer and older engines, soon after I changed again for the r580 which was a little better due to slightly improved tuning and aerodynamics ( although the new cab was the real reason)

U are right about owner drivers too, a few years back I had quiete a few trucks, I made good money at first then the diesel prices started to rise in the end the drivers were making more than me so I went back to 1 truck which I sold at the end of 2011 because I couldn't make a living from it, with the current recession bank overdrafts became impossible, diesel credit was reduced to 7 days, cash flow was a major problem as you can imagine so I sold everything and took my wife on a 7 week holiday around asia because we hadn't been away together for over 2 years, now I'm driving a heavy haulage truck earning more money than anytime in the last few years. Small hauliers just can't compete here anymore

 

I actually found especially with the Scanias going at 50 mph makes the fuel economy a little worse, I think it could be because you don't have the momentum going into hills, I used always run at 60 mph before I got my wings clipped, seemed to suit the Scanias best, everybody I know still has their Scanias running a little fast , around 57-58 mph, it definately improves the mpg's

 

I didn't know there was a difference in the diesel, I knew gasoline was different alright.

In some countries here the speed limit for trucks is 50 mph, however I find such a slow speed actually makes them worse on fuel, I think somewhere between 55 and 62 mph is the best fuel mileage

 

try to drive 80kmh and before hill bring it to 89kmh but make sure that you will accelerate until hill not to reach speed before to prevent speed limiter take your power this will increase both your momentum as you say and turbo pressure ,try to hold same gear as longest as you can downshift it 1 or 1.5gear at once depending on condition try to shift it less possible times to prevent interruption in power transmission during shifts. try to release pedal before hill this will give you best results

also in case if you have long legged truck downshift it half gear before hill

 

Yeah I know but keeping a steady pace is much better, when you have a big engine it's better

 

Maah, if it's says 400, 500 or 620 I would not say is that big difference. You are always down at the same speed. The bigger engine just keeps the speed up for a couple of seconds more. As a guy said, climb a hill fast as possible, after that you can drive whatever speed you want. Guess you drive around in a 580, by my test that's best on fuel from 83-87. Below 83 you got no momentum for the smaller steps.
Over 87 it just eat fuel, limiter at 93-94 is a killer for consumption.

 

it is good to have speed limiter higher than 89 in case if you drive 89 because when limiter cut speed and than again allow you to reach 89 and again cut....

this take more fuel than cruising little bit below speed limit

 

Put it too you this way , in the 580 at around 40 tonnes generally once you got into top gear you were in it for the day on motorway driving, smaller engines or driving too slow meant you had to change down gear Alot , this costs fuel, however a few extra rpm's or extra wind-drag from a few extra 3 or 4 kph isn't going to make much difference, really the only way it could cause It to eat fuel like you said on a differential of a couple of kms an hour is if you have small profile wheels.

 

In my experience iveco 1 to god knows how many miles, daf maximum 500,000 miles, Volvo up to 1.2 million miles, 6 cyl scania the same, scania v8's up to 2.5 million ( I have physical evidence of this , although it needs a rebuild it still starts and runs just fine)