View Full Version : Laying down the fuel economy gauntlet

09-26-2013, 05:28 AM
Some time ago I speculated that 40 MPG might be possible in an NCV3.

This week I borrowed a friend's long / tall / cargo for a few days, and - without trying too hard - came up with this Imperial figure. It's a six speed manual ECOGear 313 with Euro5 emissions and a wet kerb weight of 3,000kgs.

The speculation is confirmed then: if you want a short skinny light one you will definitely get it over the magical four zero.

Altered Sprinter
09-26-2013, 08:38 AM
Simon you are confirming what I have been doing for years with my 313 cdi MPG USA gallon 33 mpg is easy to achieve at the lower rpm sector by avoiding the turbo boost 35 MPG US can be achieved,however 28 to 32 MPG US is the norm based on fuel cetane of 55Cn under 8 Ppm M111 Euro oil economy based products ,as only MB 229.5 Mobil 0W-40 lets me do this run at lowered engine oil operating temperatures,and a little help from Liqui Moly and Wynn's products,so far the Americans are getting 22 to 27 U.S MPG on the newer 316 cdi-4-inlines.
Certifiably not new news for me:bounce: but great to hear it from your end of the block.:thumbup:
Cheers Richard

gary 32
09-26-2013, 02:10 PM
Impressive MIG.

My 07 OM 642 V6 144 low roof passenger with gde tune and some intake and exhaust "lightening" regularly achieves over 30mpg US with speeds between 45 and 58mph.

I will post a photo of my instant display if interested.
These figures also calc out with actual gallons consumed, no exaggeration required.

09-26-2013, 04:38 PM
I'm hoping to soon perform a 'tune' and work on my 08 v6 in hopes of seeing the improved fuel mileage. It would seemingly pay for the tune in a couple of years with fuel savings.

09-26-2013, 07:18 PM
16.7 mpg at 65mph 07 long wheelbase tall boy and i'm POed

09-26-2013, 10:21 PM
thats almost identical to the fuel mileage I'm getting jackpinner

09-27-2013, 04:15 AM
20 mpg on 144 tall for over 2 years. I get better mileage in city then I do on hyways.

09-27-2013, 08:36 AM
Around cities and towns I get around 25-28mpg. On the motorway I usually get around 35mpg at 65 with cruise on. Always got the xlwb full though.

09-27-2013, 11:03 AM
A GDE tune will help boost the fuel economy of all the Sprinters (2004-2008), regardless of the wheelbase and frontal area. Our goal was a 15% improvement across the rpm/load band. Of course, the other benefits include better throttle response, less soot in the engine oil, EGR gone and a wider powerband.

If you drive in the 50-65 speed range the fuel economy gain may be even better. If you plan on driving your Sprinter for at least 30k after tuning, you will have recovered the cost of the tune in fuel savings. And it will drive a whole lot better in the meantime.

Altered Sprinter
09-27-2013, 02:26 PM
Facts: Via Mercedes-Benz Daimler builders portal.This covers all Euro 5 ECV models through to 2016.... based on 51 Cn extra ultra low sulfur Diesel under 10ppm

09-27-2013, 04:01 PM
Wait, what?
How come the nafta NCV gets such horrible mpg? The 316cdi looks like the engine to have!

09-27-2013, 09:39 PM
because of our emission standards mostly.

Altered Sprinter
09-28-2013, 02:36 AM
Wait, what?
How come the nafta NCV gets such horrible mpg? The 316cdi looks like the engine to have!
Simply put as stated for near on a decade, fuel quality and top end oils.Bill you know the locals won't pay for the latter. You need 56 cetane with modified anti foaming agents including lubricants Molybdenum Disulfide under 10ppm or 10 ppm max.


MIG gets varying MPG results same as I do,it dependents on where you are going, varying terrain, loads etc, and speed presets MPH.

because of our emission standards mostly.
In part you are correct, what's missing is a FAME standard.

09-30-2013, 02:52 PM
OK, I'll bite...how do you keep a Sprinter with a Garrett VNT turbo (NAFTA here) "out of boost"?
MIG.... don't you have the 4 cylinder OM-651 in your Green machine?
How do you keep that one out of boost?
Just got the twin turbo NAFTA version of the OM-651 and it has both a high pressure fast acting turbo
for low engine RPMs and a larger higher volume turbo for higher engine RPMs.
Any Mercedes Common Rail Diesel I've ever seen or heard of has to have turbocharger boost pressure
to do much more than start.
It will idle at ambient air pressure, but to make any power, without smoking like a chimney, it has to have
turbo boost pressure to balance the fueling rate.
It's not something you (the driver) have any control over.....when you ask for more power by pressing the
accelerator, the Throttle Position Sensor signals the ECM to increase the fueling rate.
Whenever the fueling rate increases, the ECM changes the turbo variable nozzle angle to increase the turbocharger
output to match/balance the new fueling rate.
You cannot have one....without the other.
Power from a CRD requires a balance of increased fuel and increased boost. It's all programmed into the ECM.
The only way to decrease the boost (to near zero/ambient) is to coast a lot.
Then the fueling rate goes to zero (GPM flow here) and the boost drops to ambient.
Very puzzling....?

Bud Van Deusen
09-30-2013, 03:11 PM
Would like to learn more about the 'GDE' tune up, sounds like a possible safe improvement.

09-30-2013, 03:47 PM
Roger I wouldn't say that I consciously drive off boost per se - my driving style is just economy friendly, probably in much the same way that the next man's is.

Mine does have the four pot OM651 twin turbo.