2.5NA Diesel Fuel Economy - Defender Source
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  #1  
Old January 4th, 2014, 12:22 PM
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Samdford Wallace
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2.5NA Diesel Fuel Economy

So the two times I have measured my fuel economy, I have been getting around 16-17mpg. That's a lot better than my RRC, so I'm not complaining. However, it is nowhere near close to the 25mpg that people boast about on this forum. The first tank was 100% highway (although I was putting the petal to the metal the whole way home) and the second tank was about 50% city 50% highway with about the same results.

Is 25mpg realistic? If it is realistic, what are the first things to check that could be bringing my fuel economy down?
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  #2  
Old January 4th, 2014, 12:53 PM
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John B.
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25 mpg is the absolute upper end, best mileage, in a stock 90, with road tires, driving 50 mph in a 90. My range was 18 to 23 mpg, with rare times above that. 16 to 17 does seem low. The biggest thing to control is your right foot. You want good mileage, slow down....

What are the details of your vehicle?
Have you verified the distance numbers with a GPS?
Is everything is proper tune? Filters changed, valve adjusted, timing adjusted and so on...
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Old January 4th, 2014, 01:01 PM
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Samdford Wallace
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Originally Posted by Red90 View Post
What are the details of your vehicle?
Have you verified the distance numbers with a GPS?
Is everything is proper tune? Filters changed, valve adjusted, timing adjusted and so on...
Just got the vehicle. Tithonus 110 with Michelin XZL
Not yet.
Nothing has been tuned. I'll go look at the filters today. Since this old diesel is new to me, any tips on the tune up?
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Old January 4th, 2014, 01:01 PM
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I tested on 5-6 tanks when I first got my 110... verified numbers with GPS.

110 SW with road tires
2.5 N/A
90% Highway at 55-65 MPH (Floored)
10% City (slow)

Average 19 MPG
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  #5  
Old January 4th, 2014, 01:11 PM
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Quote:
Originally Posted by spammer View Post
Just got the vehicle. Tithonus 110 with Michelin XZL
Not yet.
Nothing has been tuned. I'll go look at the filters today. Since this old diesel is new to me, any tips on the tune up?
That makes a difference. They are taller, if you have a hard top. They have very low gearing making them not that efficient on the highway. A 110 is heavier and worse than a 90.

Change the filters. Run some good diesel fuel conditioner through it. Check the timing. Normally they can do with a bit of advance.

Make sure you are calibrating distance with a GPS. The speedometers are never correct.
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Old January 4th, 2014, 01:22 PM
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Samdford Wallace
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Quote:
Originally Posted by Red90 View Post
That makes a difference. They are taller, if you have a hard top. They have very low gearing making them not that efficient on the highway. A 110 is heavier and worse than a 90.

Change the filters. Run some good diesel fuel conditioner through it. Check the timing. Normally they can do with a bit of advance.

Make sure you are calibrating distance with a GPS. The speedometers are never correct.
It sounds like maybe I am within 10% of where I should be. Probably due to miscalculation or a simple tune up.

So 25mpg is pretty much for a 110 2.5na running downhill with road tires? Perfect and ideal circumstances?

Out of curiosity, what is the real world mpg of the 200tdi? I've read 30mpg, but I'm guessing it's quite a bit lower under normal circumstances.
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Old January 4th, 2014, 01:31 PM
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Quote:
Originally Posted by spammer View Post
It sounds like maybe I am within 10% of where I should be. Probably due to miscalculation or a simple tune up.

So 25mpg is pretty much for a 110 2.5na running downhill with road tires? Perfect and ideal circumstances?

Out of curiosity, what is the real world mpg of the 200tdi? I've read 30mpg, but I'm guessing it's quite a bit lower under normal circumstances.
remember the UK gallon where a lot of these figures originate is larger than a US gallon
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  #8  
Old January 4th, 2014, 01:39 PM
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Quote:
Originally Posted by spammer View Post
It sounds like maybe I am within 10% of where I should be. Probably due to miscalculation or a simple tune up.

So 25mpg is pretty much for a 110 2.5na running downhill with road tires? Perfect and ideal circumstances?

Out of curiosity, what is the real world mpg of the 200tdi? I've read 30mpg, but I'm guessing it's quite a bit lower under normal circumstances.
25 mpg for a civilian 90. I doubt you would get there in a 110. The 110 have the lower range transfer case and are heavier. You can change it, but then loaded, you might not have enough gearing.

25 mpg is about it for a 200TDI as well in a 90. As Jason says, be careful what you read as some people talk in imperial gallons. Anything you do, lift, larger tires, roof rack will make it worse.
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  #9  
Old January 4th, 2014, 01:48 PM
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Quote:
Originally Posted by leastonce View Post
remember the UK gallon where a lot of these figures originate is larger than a US gallon

Not alot of people know that, I have even been asked if the litre is different? D'oh!
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  #10  
Old January 4th, 2014, 02:40 PM
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Quote:
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Out of curiosity, what is the real world mpg of the 200tdi? I've read 30mpg, but I'm guessing it's quite a bit lower under normal circumstances.
I average (about 50% in town/50% freeway) about 24mpg in my 200tdi 90 on 33" mud terrains and 70mph on the freeway. I have a full width intercooler with upped fueling/boost.
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  #11  
Old January 4th, 2014, 06:32 PM
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My 2.5 NAD is getting around 19/20. That being said I don't push it too hard either. When I get there...I get there. Running the Radial Rover 32". I know it has fallen off lately due to the increasing injector pump leak.
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  #12  
Old January 4th, 2014, 07:56 PM
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I got 22.5 average on the trail in Utah. That's driving 20-30 mph on the dirt roads and 40-45 on the hardball. I'm a slow driver even in a fast car and I've never floored my truck. When I'm out on a long trip, I'm going for cool running and reliability above all else; good gas milage is a pleasant side effect of taking it easy. If I'm looking to haul ass some place, I'll take the LR4.
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  #13  
Old January 4th, 2014, 10:33 PM
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The best I have been able to record was 22.8 mpg. I have only paid close attention while on long trips.
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  #14  
Old January 4th, 2014, 11:20 PM
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I have achieved 25mpg highway speeds at 60ish mph in my 200tdi 110. No roof rack and running fresh 255/85 km2's.. Speedo is a VDO unit calibrated via gps and is spot on up-to 70 not sure past that. This was after a rebuild of the injectors not sure the condition of the pump seems to be original and runs well.
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  #15  
Old January 5th, 2014, 12:39 AM
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I'm getting 25ish, on the last road trip I got 28-29 highway keeping rpm's low but still running 55-60
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  #16  
Old January 5th, 2014, 03:09 AM
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I've gotten 24 - 28 mpg on mine Sam. 24 when doing ~50% hwy @ ~60mph. I get ~28 when riding easy in town, running higher gears at low speeds. I'm also religious about keeping the tires inflated on the high side.
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