mpgs for diesels? - Defender Source
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  #1  
Old June 2nd, 2008, 11:24 AM
Z O O R O P A
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Jeremy/James
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mpgs for diesels?

any reports on mpgs for 300tdi or the 2.5?

I know the 3.9 petrol averages 12 mpg for a 110 and up to 15mpg for a 90

anyone have a 300tdi in a 90?

I've looked around the net but most data is very second hand, was looking for some owners to chime in

many thanks!
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  #2  
Old June 2nd, 2008, 11:52 AM
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Brad Harris
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Mine seems to vary a lot depending on what I'm doing and how I'm driving etc....

but the last time I filled up it came out at 27mpg
(this was mostly highways with speed limits around 55mph and only moderate hills)
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  #3  
Old June 2nd, 2008, 02:56 PM
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John B.
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200TDI 90 hardtop. Military LT77, 1.4 LT230. Could do with higher gearing to improve highway mileage.

Best tank, 26 mpg.
Worst tank, 18 mpg
Average, 23 mpg.
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  #4  
Old June 2nd, 2008, 03:59 PM
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97' Disco-I with 300tdi:

30 mpg on highway trips (60-65) and average about 25-27 city.
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  #5  
Old June 2nd, 2008, 05:00 PM
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Keith Kreutzer
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110 300Tdi 5 Door
1.4 T Case
285-75's

Best tank 25MPG (summer fuel, no roof rack)
Worst tank 12 MPG (50 MPH headwind, winter blend fuel roof rack)
Normally about 23MPG

It's running rich, I think is can squeeze another MPG if I tune her up.

Slower is better with this truck.. Even with the svelty Aero-dynamics
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  #6  
Old June 2nd, 2008, 05:38 PM
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Ex-Mil 110 hard top with 1.4 transfer box

Last tank with the 2.5 NA mixed city/hwy was 16.5 (20 Imp) mpg
First tank with the 300Tdi mixed city/hwy was 20 (24 Imp) mpg

Of course with the new Tdi I can't keep my foot out of it so the mileage is going to suffer a bit. I'm expecting an improvement once (if) the novelty wears off.

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  #7  
Old June 2nd, 2008, 06:41 PM
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Quote:
Originally Posted by revor
110 300Tdi 5 Door
1.4 T Case
285-75's

Best tank 25MPG (summer fuel, no roof rack)
Worst tank 12 MPG (50 MPH headwind, winter blend fuel roof rack)
Normally about 23MPG

It's running rich, I think is can squeeze another MPG if I tune her up.

Slower is better with this truck.. Even with the svelty Aero-dynamics
Good call winter vs. spring/summer...... this past winter the mpg was way off average.
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  #8  
Old June 2nd, 2008, 08:00 PM
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Neil Steinhagen
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Can the winter vs. summer mileage be offset by running a biodiesel mix?
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  #9  
Old June 2nd, 2008, 08:48 PM
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Quote:
Originally Posted by steinhnj
Can the winter vs. summer mileage be offset by running a biodiesel mix?
You are getting into other problems there: biodiesel has a higher gelling temp than straight petroleum diesel.

You can read about the problem here:
http://journeytoforever.org/biodiesel_winter.html
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  #10  
Old June 2nd, 2008, 11:33 PM
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Todd Miller
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I have a 1996 disco with a 300tdi. It has OME HD lift 235/85/16 AT tires and an ARB brush no winch. I get about 21 MPG. This seems a bit low compared to what others are seeing. Any suggestions? Seems to run fine no heavy smoking etc.

thanks for any advice.
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  #11  
Old June 3rd, 2008, 05:50 AM
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That's normal, honest and realistic. I have yet to see one get over 25mpg in the most optimistic of evaluations, and I get to "evaluate" many. It doesn't seem to matter what they are in either, although the 110 will get very slightly less mileage and the RRC seems to get very slightly more. Properly run in brand new motors, say at 5k miles are generally the best and will get around 25mpg but older motors seem to be in the 21-23mpg range.

I can get mine down to 16-18mpg if driven hard. If I drove a V8 like that I'd likely be down to 9 or worse.
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  #12  
Old June 3rd, 2008, 06:41 AM
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Quote:
Originally Posted by junkyddog11
That's normal, honest and realistic. I have yet to see one get over 25mpg in the most optimistic of evaluations, and I get to "evaluate" many. It doesn't seem to matter what they are in either, although the 110 will get very slightly less mileage and the RRC seems to get very slightly more. Properly run in brand new motors, say at 5k miles are generally the best and will get around 25mpg but older motors seem to be in the 21-23mpg range.

I can get mine down to 16-18mpg if driven hard. If I drove a V8 like that I'd likely be down to 9 or worse.
Not counting this past winter, I have been able to achieve 30 mpg on long highway trips. I think a lot comes down to driving style as well. You can certainly gain a few points or loose a few.
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  #13  
Old June 3rd, 2008, 06:50 AM
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Jim Cheney
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I can get an honest 23-24 consistently when driving conservatively. If my wife drives downhill in a tailwind, then 26 is possible.

The brits confuse everyone by quoting mileage in imperial gallons, which makes Tdi's appear to get 27-28 normally, then people over here prefer the statistic over the reality and quote the same figure. I think its the same process that leads people to believe that acetone or that little fan-shaped objects in your intake increases fuel milage. I'm always amazed how much belief and faith factors into what otherwise is a very simple calculation...
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  #14  
Old June 3rd, 2008, 07:26 AM
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Gavin Davis
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200TDi's have been seen to get 35mpg on motorway runs, obviously this drops dramatically round town. Also don't forget that our gallon is bigger than yours!
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  #15  
Old June 3rd, 2008, 09:10 AM
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Drove my brand new (well it had 2000 mile on it) 300tdi from Beaumont, TX (flat) to Silverton, CO (mountains) area, then on to Moab, last year about 4000 miles. Best I got was 22mpg, most of the time I got around 17mpg. I did notice that the a/c had a mark effect on my mileage.

On the other had I had a td5 crew cab 110 and it got 27mpg all the time. I even got 31mpg average on a little 500 mile trip I took.

Around town my 300tdi never got over 22mpg. I would say I averaged about 19mpg on all my normal driving. I even drove with the intent of getting better mileage and never could, so I just said to hell with it. And btw the 300tdi was in a NAS d90 with a full external roll cage and galvanized chassis so I am sure it was a little heavier than stock. I was running 33" tires, with a 1.4 lt230 and stock 3rds.
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  #16  
Old June 3rd, 2008, 02:58 PM
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I can say that I have at least 6 trucks on the road getting 30 mpg and upwards. US gallons. All manual transmission vehicles. D90,s RRCs and a Disco.

I'd like to take all the credit for my tuning and drivetrain work but the operator behind the skinny pedal has to make most of the effort. And fuel quality is an issue but not type. Biodiesel can do it. Hope to see a SVO truck do it soon as well.

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  #17  
Old June 3rd, 2008, 06:14 PM
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John B.
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Quote:
Originally Posted by pendy
I can say that I have at least 6 trucks on the road getting 30 mpg and upwards. US gallons. All manual transmission vehicles. D90,s RRCs and a Disco
What kind of gearing Jim? With my gearing, I'd have to travel 55 to get that mileage, but I'm lower than stock.
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  #18  
Old June 3rd, 2008, 08:11 PM
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jim pendleton
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Not a simple answer. Overall tire size. Vehicle height. Pump adjustments for cruise speed. Every vehicle brings its own challenges.

Tell you what. Tell me what you have and I will make some suggestions. For the sake of discussion. I'll talk you through the process I would take to improve your situation. I know you can be skeptical so it will be a good exchange of information. Maybe you take me up on my suggestions maybe you don't. But we will e-tune your truck regardless.

JP
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  #19  
Old June 3rd, 2008, 08:26 PM
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John B.
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90 hard top, say 4500 lbs empty. Stock height. 200TDI (as is 16 years old, unknown life...), diaphragm 90 degrees clockwise, boost 13 psi (at 4000 feet). 235/85/16. 51A (military) LT77, 1.4:1 LT230, stock R&Ps.

I know the gearing is too low. 1st is useless on the road and it is reving too high on the freeway for good mileage. I've been thinking swapping to 1.2:1. I'm not afraid to downshift....

And I do trust you Jim. I just like to argue.....
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  #20  
Old June 3rd, 2008, 09:10 PM
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Pendy,
Can you squeeze any more out of my Toyota natural ? 4 liters and getting consistently 17-18/335-345 miles per tank. 33x11.25's, 3 inch lift, heavy as hell and tall as hell. Flog it or gentle seems to get the same. Nippondenso 6 cyl pump.

Think I have an angle on a Defender TDI/lt77/230 setup for July transplantation. Fingers crossed
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