fuel consumption with roofrack

[sixmaniac]

I get about 9.5km/l on my Gen 4 DiD on the open road. We are planning a 4000km trip to Nam in June, but I have no idea how the newly fitted roofrack is going to afect the fuel consumption figure. Any thoughts? It wont be stacked higher than an ammo box or 2, and a spare wheel.

[Gemaskerde Tuinvurk]

I found that with a spare tyre and 4 Jerry cans on the roof, my mileage on the open road only went down to 9km/l. (this is at about 120km/h)

[Bennvdm]

Hi

I have a gen3 3.2did & on mine just the empty roofrack takes it down from 9km/lt to about 7.5km/lt.

I have slightly bigger tyres than standard (265/75r16 instead of 265/70r16), but speedo is now almost 100% accurate against GPS speed. The BFG MUDs also seem to make about 1km/lt difference.

This is on the front runner slimline cheetah kit mounted on front runner rails (removed factory fitted load bars & rails).

With Rack Laden with some wood, spare wheel & 2x Jerry cans it goes down to 6-6.5km/lt.

I have a manual transmission though. All on 120km/h on true speed per GPS.

Regards
Bennie

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[Gemaskerde Tuinvurk]

Hi

With Rack Laden with some wood, spare wheel & 2x Jerry cans it goes down to 6-6.5km/lt.

Wow! On the open road!?? That's very low!

Mine is on HT tires...

[Bennvdm]

Yip. I am contemplating getting a 2nd set of rims with HT tyres for long mainly tar road trips.

Also looking at building myself a hoist to fit & remove rack in garage, as difficult to manually.

I forgot, also have an ironman suspensions, so also lifted a bit against standard.

Further good news is that Namibia will finally be getting low sulphur diesel. Supposedly already available at some stations in Windhoek, but I not seen any yet.


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[SimonB]

With Rack Laden with some wood, spare wheel & 2x Jerry cans it goes down to 6-6.5km/lt.

Jo... I get 6.5 to 7 with a fully laden roof rack on my 3.5

And fully laden is...
Table
Solar panel
Chairs
Tent
4 ammo boxes
Hi-lift
4 Jerry Cans

Ok that's at 110 but I'd be expecting MUCH better than that from the DiD

[sixmaniac]

I must say, driving style makes a HUGE difference on consumption. I never got more than 7.5km/l on my Gen 3 DiD. No roofrack, no passengers, no nothing! You still manage a lot more!
On the Gen 4 (commonrail) I can get get it up to 10.7 with cruise control set at a VERY steady 120km/h, but it goes as low as 6.8km/L in town.

Tuinvurk, if you say yours went down to 9 with a loaded roofrack, what was your average before? In other words, what did it drop by? Did you also get about 9.5 average?

[Gemaskerde Tuinvurk]

I'm not talking about in town, I'm talking about cruise control set at 120km/h on highway.

Pre roof rack, I got mostly 10km/l, but sometimes up to 10.5km/l (on the way down to Mosselbaai from jhb).

Post roof rack (empty) I average around 9.5km/l

Roofrack loaded last year and this year to botswana I averaged about 9km/l.


If talking about in-town trips it's a total different story! Sadly I do about 70% of my mileage in town. On my latest tank, I've only driven the 6km between work and back (and one or two trips to Sandton - 15kms), no highway, just stop and go. On this tank I'm averaging 7km/l (that's with an unloaded Roofrack )

So yes, very much dependent on drive style, terrain, extras, tyres, speed, load

[Bennvdm]

Mine is also for open road. Some might be at slower than 120kph, as most use for trips and involve gravel etc.

I took off my rack in Dec before going to Erindi for Christmas. Before, I was lucky to get 8km/l with rack- 7.5 better ave for real use.

Since then all have been over 8 even 10. Last 4 tanks per gas cubby app- 10.5, 9.6, 8.7 & 8.5. 10.5 was for driving slow in Etosha with speed control on about 50kph in 3rd gear.

My laden figures may be distorted a bit due to some offload use, as only tend to load rack when going offload.

Bennie

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[Lock]

I get about 10% better consumtion with the roof rack off on the open road. Can't really tel around town as the consumption figures are wildy different from tank to tank... Frontrunner Leave the pillars on or mark where they were, as it's a slep getting them aligned every time.