fuel economy of recent trip, does this look right?

[Eevo]

12,000km
$2000
assuming $1.6/l
1250l of diesel

car computer indicated 12.4l/100km
manual calculator is 10.4l/100km


08 RRS TDV8 pulling 800kg camper
larger tyres and engine tune.



does this seem correct?

[Eevo]

oh, and sitting on 110km/h on the road when i could

[Ean Austral]

Yep , TDV8 shouldn't feel 800kgs on the rear, and assume the trailer is the same height or lower than the RRS.

Cheers Ean

[Ean Austral]

oh, and sitting on 110km/h on the road when i could

My D3 is prolly more economical at 110 than 90, as it hunts gears at 90 and the revs are from 1400 to 2100 , but@110 it sits on 1400rpm all day

Cheers Ean

[Eevo]

but@110 it sits on 1400rpm all day


i think the rpm at 110 was closer to 1800rpm.

is there a way to tell what gear im in?

[Ean Austral]

i think the rpm at 110 was closer to 1800rpm.

is there a way to tell what gear im in?

put the foot down and see if the revs drop then you are not in top gear .[bigrolf][thumbsupbig] .... not sure about the TDV8 might have the 8 speed box so you may need to do 115 to get top gear.

Cheers Ean

[Eevo]

put the foot down and see if the revs drop then you are not in top gear .[bigrolf][thumbsupbig] .... not sure about the TDV8 might have the 8 speed box so you may need to do 115 to get top gear.

Cheers Ean


its a 6 speed.
well go for a drive...

[Ean Austral]

its a 6 speed.
well go for a drive...

My TDV6 with 6 speed settles into top gear towing the camper at about 105km/h and will stay there , drop below that and it starts to hunt gears. I drive by the tacho when towing , not so much the speedo.

you could always put it in sports mode and try changing the gears yourself , that would give you an idea.

Are you looking for better ? or did you expect it to be more ?

Cheers Ean

[Eevo]

Are you looking for better ? or did you expect it to be more ?



not really sure to be honest.

[Ean Austral]

Not sure what our camper weighs but would think loaded 1000 - 1200kgs

Standard is about 10.2 ltrs / 100ks with road tyres and no roof rack on highway.

M/T tyres and roof rack see's me at 13 ltrs / 100ks .

Same car , same camper , remove or change something and the fuel will alter between the 2

D3 TDV6 6 speed .

Cheers Ean

[justinc]

Tuned and towing and enjoying the 'tune' will see 12. 10 even towing a light camper without hills etc is very possible if driven carefully.
Jc

[101RRS]

car computer indicated 12.4l/100km
manual calculator is 10.4l/100km

I think you have those numbers the wrong way around - the dash readout is always optimistic by about 10%. So if your dash readout was 10.4l/100km I would expect the real calculated would be the 12.4l/100km. However if the dash reading was 12.4 then I would expect your real usage would be around 14.

Garry

[justinc]

Mine is regularly around 1.2 optimistic. An 8.5 on the dash is a whisker under 10 at the pump.

[Eevo]

I think you have those numbers the wrong way around - the dash readout is always optimistic by about 10%. So if your dash readout was 10.4l/100km I would expect the real calculated would be the 12.4l/100km. However if the dash reading was 12.4 then I would expect your real usage would be around 14.

Garry

numbers not around the wrong way. but the 10.4 might be missing a fill up or 2.

[Eevo]

the hard bit is that my tyre size is out. which puts the trip km's out and the computer calculations.

and ive figured out tonight this cannot be correcting, even by editing the CCF

[p38brickus]

I've been averaging 16.3 over the last month driving my TDV8 and towing 25 foot caravan to Darwin. Use 5th gear not O/D 6th. I put some Shell Extra diesel in it at Coober Pedy and turned it from a flying machine into a fire breathing flying machine. The difference was so noticeable.

141634

[Rextheute]

Brickus , that is a sharp looking setup !

2 thumbs up .

ps , my economy ( v6 ) is 9.3 not towing 11.5 towing camper and 12.8 ish ...towing caravan .
however I don’t stress about it - other tow cars - even when not towing regularly saw 20plus !

pps , do the big wheels ,small sidewall tyres give you pause - I have the same at present on my RRS and with the potholes and rubbish roads have ‘ concerns ‘

[p38brickus]

Brickus , that is a sharp looking setup !

2 thumbs up .

ps , my economy ( v6 ) is 9.3 not towing 11.5 towing camper and 12.8 ish ...towing caravan .
however I don’t stress about it - other tow cars - even when not towing regularly saw 20plus !

pps , do the big wheels ,small sidewall tyres give you pause - I have the same at present on my RRS and with the potholes and rubbish roads have ‘ concerns ‘

Regularly hear that 200 Series Cruisers are in the 22's plus fuel economy. But you're right, I don't sweat it, just love driving the car and the fuel economy is a bonus. [biggrin]
That photo with the 22's and low profiles was taken when we did a short run up to Mallacoota in December, 200 kms from home. I was too lazy to change wheels. [bighmmm]
For this trip (12000kms approx.) I've put my 20's and higher profile tyres back on for the same reason you mentioned.

141642

[taffy]

We have just completed 6 week trip from Newcastle to Darwin and back.
2008 TDV8 towing almost 2000 Kg off Road camper

8850 Km Average 17.66l/100Km
traveled at posted speed limits.
Its good to be able to overtake 4 trailer roadtrains with the occasional burst up to 130 in the NT where roads allowed

[Konradical]

Something interesting to note in my experience, towing our little Jayco Dove Outback with our MY16 D4, we regularly get about 14-16lt/100. That's up here in the Top End. Down South though, we can knock at least 2lt/100km off of that.

We were at 9.8lt/100 at one stage between Pt Augusta and Adelaide.

These are all maths derived numbers also.