D40 fuel consumption - Nissan-Navara.net
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post #1 of 23 (permalink) Old 13-01-08, 07:52 PM Thread Starter
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D40 fuel consumption

Hi Guys,

I currently have a Rally Raid which averages around 26mpg. This weekend my dealer has loaned me an Aventura automatic as I am thinking of changing it. I love the truck but am concerned about the fuel consumption. I put in 4 gallons when I picked it up & 70 miles later the fuel light was on. I checked the on board computer which tod me I had acheived 19.8 MPG. When I checked the fuel consumtion history it shows it has never achieved more than 20 mpg. I drove it the same as I drive my D22 with some motorway & some urban work.

Is this normal fuel consumption, are manuals better or is there a problem with this truck?

Anyone want to buy an excellent Rally Raid? 50.000 miles, FSH, New clutch, exhaust, wheels(outlaw 17"), fitted tow bar, soft front bar, Snug top XTR & bedrug. Not your usual rubbish probably one of the best available. Finished in silver with graphite graphics

No VAT, 10,000
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post #2 of 23 (permalink) Old 13-01-08, 08:07 PM
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http://www.nissan-navara.net/viewtopic.php?t=3071 Read this mate - should keep you quiet for a bit and answer the question!

cheers

Rob

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post #3 of 23 (permalink) Old 13-01-08, 09:11 PM Thread Starter
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Just read that thread & it seems I can expect between 14 & 35mpg. The blurb that the fealer has given me suggests I can get 27.7 mpg on the combined cycle in an auto & 28.8 for the manual. I see little point in changing my D22 which has never returned less than 23 mpg(towing at ap to 80mph) for a vehicle that is the best part of 29,000 with vat & accessories for a vehicle that returms at least 5 mpg less.

I will talk to my dealer when I return it tommorrow.

Ken.
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post #4 of 23 (permalink) Old 13-01-08, 09:27 PM
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towing at up to 80mph,

and people wonder why they blow up!!
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post #5 of 23 (permalink) Old 14-01-08, 08:58 AM Thread Starter
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Quote:
Originally Posted by frogeye1000
towing at up to 80mph,

and people wonder why they blow up!!
A very ill informed comment. Far less damage is done to an engine at cruising speed than on the stop start urban cycle. I usually tow at between 60 to 70 mph with my race car on the back & at this speed the truck is perfectly comfortable & I am using very light throttle to retain this speed. Also when I come to an incline I have the momentum to ascend it without undue stress & strain on my engine/transmission. My point was I can drive my truck & towing at speeds of UP TO 80 mph without severely affecting the fuel consumption. Surely this statement in itself proves that I am not putting undue stress on my engine, if I was the fuel consumption would fall dramatically. When the truck does reach 80 mph towing it is always on a slight downhill with very light throttle. The D40 I have borrowed cannot acheive 20 mpg without a trailer on the back.
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post #6 of 23 (permalink) Old 14-01-08, 09:48 AM
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Well i don't get it with the whole fuel consumption thing?

I'll give you a few examples, i recently sold some Nav stuff, and each time the buyers came to collect the stuff, we had little chats etc regarding the D40 in general.

I made a point of asking what sort of fuel consumption were they getting?

These were the answers:

06 Outlaw King cab Manual = 27-30mpg

56 Aventura auto = 20-22mpg

56 Aventura auto =28mpg

07 Outlaw Double cab manual = 28-30mpg

55 Outlaw Double cab manual =30-32mpg

Obviously the above info was what the owners told me, i can't confirm it.

My own Truck 57 Aventura auto is returning between 20-24 mpg, now 23-24mpg is very rare in my case, and the norm is about 22mpg.

I have a Roll n Lock tonneau cover which is closed for 99% of my driving, but i have 22" rims fitted and the overall diameter is slightly smaller than the stock wheels and tyres, so i suppose that has to be taken into account.

When i hear of D40's doing upper 20's and low 30's to the gallon, i'm jealous and a bit puzzled tbh. Why is there such a big margin on various trucks?

I know driving style makes a difference, but i think the trucks must all be mapped slightly different?

Guy has an auto, he said this in another post:

"auto - huge 4 lamp pikey lights on the roof, drive like a ****, 28mpg...."

I would be over the moon if i was getting 28mpg

Looks like my Navs computer is quite accurate too, as i worked out the fuel consumption manually:

Nav D40 spec says 80ltr tank in gallons that's......17.60 gal

I'm getting about 360-370 miles out of a tank full, and that's down to vapour i would think?

So 370 divided by 17.60 = 21

I was told the later Navs are supposed to be more economical, obviously not the case?

I'm not too bothered about my consumption, i'm more concerned at why there are so many variations, and big margins also?

I hate to think what i'd get towing!


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post #7 of 23 (permalink) Old 14-01-08, 09:58 AM Thread Starter
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Obviously the spec of the truck will make a difference. I know a guy who had an old model L200 (2004) & was getting 23 mpg with an open back. He fitted a canopy (hi top) & then got 27mpg.
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post #8 of 23 (permalink) Old 14-01-08, 10:12 AM
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Quote:
Originally Posted by Motorracinggrandpa
Obviously the spec of the truck will make a difference. I know a guy who had an old model L200 (2004) & was getting 23 mpg with an open back. He fitted a canopy (hi top) & then got 27mpg.
From what i've seen of the D40's the spec seems to make very little difference?

If you look at my first post, you'll see two Aventura autos, same spec, same age, no mods or anything added and yet the consumption is almost 8mpg difference?

And it's like that accross the board from what i've seen, like i said, i just don't get it?



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post #9 of 23 (permalink) Old 14-01-08, 01:43 PM Thread Starter
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I have now returned the D40 to the dealer. On the return journey I drove like a complete nance. Tickling the throttle very gently & not exceeeding 75mph on the motorway. When I arrived back at the dealer the computer, which I reset before I left home, showed 24mpg.

The dealer told me his previous demo D40 regularly showed 28 mpg despite many different drivers. He has asked the service dept to take it up with Nissan & he will let me know what they say.


Interesting!!!
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post #10 of 23 (permalink) Old 14-01-08, 02:20 PM
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Quote:
Tickling the throttle very gently & not exceeeding 75mph on the motorway. When I arrived back at the dealer the computer, which I reset before I left home, showed 24mpg.
Thats what I'm getting and driving the same way. Cant get above 24.8 and that is if I dont start the engine!!
I have an 08 Nav manual with snugtop, and got 23mpg out of my 53 Ranger towing or not. I also would have really wanted better mpg out of an up to date car

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Rob

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