What's your fuel mileage driving volvo 780 with volvo or cummins engine?

I do alot of heavy haulage now, some of it for Hyundai heavy machines, they have cummins engines, the dealer tells me they have really suffered in mpg's and reliability since the introduction of these Envoirnmental measures, mainly egr, not only cummins have suffered almost all manufacturers have too including Volvo , not as bad I think but they have suffered too, just as a contrast scania will offer all 6 cyl engines egr or scr, the difference is 1.8 mpg average between egr and scr, just proves egr is the main problem of modern engines and these laws that force these is the problem, why trade lower emissions for higher fuel consumption? Is there a point other than extra revenue for governments?

A guy (riverstick) on this forum once said about egr; "you can't expect a top athlete to perform his best while inhaling his own farts"

 

i agree EGR has caused a lot of problems for truck owners

 

I think it's the main problem of both owners and manufacturers! I don't think either want it

 

The pure massive weight is the problem. A car that gets 40 mpg weighs 1.5 tons. A fully loaded big rig weighs 40 tons. The big rig also has a huge sail in front to catch the wind and slow it down.

The truck weighs 26.6 times as much as the car. 40mpg/26.6=1.5MPG. Per pound the truck is actually a lot more efficient since its over 1.5 mpg.

40 tons is just a huge amount of weight and it requires a lot of power to move it.

 

As a matter of fact the new trucks we're seeing now are Alot like that, the new scania 730hp will do 11 mpg's at 97,000lbs and the new mercedes actros is capable of 12mpg and the mercedes has a Detroit deisel engine and scanias fuel system was co-designed by cummins so 10 - 15 mpg trucks are on the way!

 

what he is saying....to get accurate reading of fuel mpg. you right down the mileage when you fuel up the truck. when you fuel up again you subtract beginning mil from current mil then divide those mil by gallons you just purchased. thats a accurate measure of mpg. do that for 30 days and you get a true reading of what your trucks mpg

 

Note that I said fuel expense, meaning fuel cost (pump price minus company discount) minus FSC paid, divided by miles. My truck is about to go over 500k miles and this number is 13.55 CPM since the beginning of my lease, about 3 years and 10 months ago.

Jim

 

I see your calc

0.42 fuel / 7.0 mpg. = 2.94
0.10 discount = 3.04
Pump price is 4.10

410-304 = 106
106 / 7.0 = 15.14

Total CPMF ( for fuel ) = 15.1

So if you get 1.00 a mile
15.1 comes off your base rate of 1.00
Leaves you 0.85 for

Truck
Plate
Insurance
Income

 

But I thought they were talking about fuel mileage not CPM for fuel

So yes to calculate your true fuel mileage it's pin and paper

Gallons used / miles driven = fuel mileage

No more accurate way to do it than that

 

2011 780 13 speed Cummins 535 House Hold Goods setup went to TX loaded getting 7.3 came back empty at 9.2 cruise set at 65. It is slow but my fuel surcharge paid me a round trip ticket.