V6 fuel type and consumption

[Leethal Advanced Member Find all posts View Profile Close Leethal]

Re: V6 fuel type and consumption

Having just read through all the posts I believe you may be under estimating the increase caused by the tyre change.

On my 90 series going from Grand Trek type tyres to Cooper ATR added 1 litre/100 km
Changing to 265/75 MTR from 265/70 ATR adds another 1-1.5 litre/100 kms.

Having the two sets of tyres fitted on the same genuine rims shows the fuel consumption changes are purely a result of tyre constuction & tread design.
As its a second vehicle and doing the same 400 km run regularly on w/ends the fuel rates are consistantly the same.

I fitted a supercharger and have found the fuel consumption figures still have the same increase/decrease with tyre changes as before fitting the blower.
Although I'm using less fuel with the blower than without

So it wouldn't surprise to increase consumption by 1.5 -2 litres/100 kms by fitting 275/65 ATR's in place of 265/65 OE Road tyres especially if the ATR's are Light Truck construction.

Lee

[yowie Advanced Member Find all posts View Profile Close yowie]

Re: V6 fuel type and consumption

If you can afford to buy a Prado, you can afford to run it. :lol:

Wait until the engine has more running time on it and things will improve. I use 95 octane, drive it reasonably gently, until I get the shits with the world and put the boot in. :evil:

As suggested, try the economy again at 10,000 kms. Mine is just over 14 with 3,000 on the clock.

Yowie.

[bertram35 Junior Member Find all posts View Profile Close bertram35]

Re: V6 fuel type and consumption

HI all,
I have petrol kakadu....love it!

However petrol consumption is nowhere near Toyota's claimed 11.7 combined.
Now have approx 12,000kms and just did a return trip Syd-Melb-Syd.
99% freeway - no off road, no suburban driving.
Set of golf clubs and a samll bag of clothes in the back.
Driving easy and on speed limit the whole way.

Reset computer after filling at start of trip on the freeway - 10 hours later in Melb consumption was at 11.8.
Return trip was higher at 12.7 - I think due to the rain.
Overall average for trip was 12.2l/100

Around Sydney with numerous small trips I am usually sitting at around 18l/100.

Great car - but very dissapointed by Toyota's misleading fuel consumption claims.
Rgds
ML

[hookedon4wding Advanced Member Find all posts View Profile Close hookedon4wding]

Re: V6 fuel type and consumption

HI all,
I have petrol kakadu....love it!
Around Sydney with numerous small trips I am usually sitting at around 18l/100.
ML

Presume this is with the factory tyres? If so it kind of supports my disappointment.

I refuse to believe that changing from 265/65's to 275/65's will increase fuel consumption dramatically. It's only a 12mm increase in overall diameter.

As for weight, if adding slightly heavier tyres (what are they, maybe 5kg heavier per tyre?) increases fuel consumption by any significant amount then with 5 people on board (at say 70kg each) I would be lucky to get around the bock on one tank.

I would be surprised if adding the tyres has made any more than 1l/100km in total difference which still leaves a lot to get anywhere near the claimed consumption.

As for the cost for fuel, doesn't worry me, I'm happy to pay for the performance. It's the reduction in range (based on published figures) that annoys me. Looking at the brochures, road test etc, you would expect to comfortably get 1000km out of a tank (usable amount 140l and averaging 14l/100km) in the petrol on the road. I haven't broken 800km yet.

Cheers, Sam.

[Guest Close Guest]

Re: V6 fuel type and consumption

As for weight, if adding slightly heavier tyres (what are they, maybe 5kg heavier per tyre?) increases fuel consumption by any significant amount then with 5 people on board (at say 70kg each) I would be lucky to get around the bock on one tank.

The extra weight per tyre is not equivalent to adding the same amount of weight in the cabin. It's got to do with moment of inertia. With rotating objects, the more weight you put further away from the spinning centre, the more energy it requires to make it spin at the same angular velocity.

An example is an ice skater. With their arms out, they spin slower. With their arms in, they spin faster.

The difference in tyre diameter affects the odometer the same way it affects the speedometer. So you need to correct the km in your trip meter by the same percentage change in your tyre diameter from standard size.

However, I agree that the fuel consumption is a bit too high for a modern dual VVTi engine. The extra weight that the 150 put on doesn't help either.

[hookedon4wding Advanced Member Find all posts View Profile Close hookedon4wding]

V6 fuel type and consumption

As for weight, if adding slightly heavier tyres (what are they, maybe 5kg heavier per tyre?) increases fuel consumption by any significant amount then with 5 people on board (at say 70kg each) I would be lucky to get around the bock on one tank.

The extra weight per tyre is not equivalent to adding the same amount of weight in the cabin. It's got to do with moment of inertia. With rotating objects, the more weight you put further away from the spinning centre, the more energy it requires to make it spin at the same angular velocity.

Yeah please excuse my facetious post. I did have an idea about the tyre weight thing (just not the technical explanation). Bad example, my bad

Re the difference in odometer, pre tyres the GPS showed 98km/h when I was sitting on 100km/h on the speedo. Now with the tyres the speedo and GPS match at 100 km/h. So if the difference is only 2km in 100 then over 800km it's only 16km. Not a huge difference.

Anyway, no point getting into a tit for tat. I absolutely love the car and can handle the fuel cost. Just disappointed that I can't get anywhere near the published figures even with very few modifications.

Might have to try not babying it as recommended and see if that helps.

Cheers, Sam.

[Guest Close Guest]

Re: V6 fuel type and consumption

Anyway, no point getting into a tit for tat. I absolutely love the car and can handle the fuel cost. Just disappointed that I can't get anywhere near the published figures even with very few modifications.

Hi Sam,
I hope that you don't see my posts as being argumentative. I'm offering reasons why your fuel consumption might be high and if you took the necessary adjustments (due to the mods on the car) and still see that the figure is high, then I myself would want to bring it up to the dealer. I myself put on 265/70R17 and noticed that my fuel consumption went up quite high, until I realised that I needed to do the odometer correction. But because I'm running 70 profile tyres, it required a correction of 5%. This is equivalent to nearly 1L/100km for my experience.

Might have to try not babying it as recommended and see if that helps.

It would be good if there is some scientific way where we can conduct an experiment on a straight bit of flat road about 1km long and doing 3 things:
1) take off slowly to 60
2) take off normally to 60
3) take off spiritedly to 60
It would require a device to take instantaneous fuel usage and distance covered.

Also because you have bigger heavier tyres, you also have a lot of momentum once you get moving. So get off the go pedal earlier and you will find that you coast longer. At least that is with my experience with the 70 profile MTRs which are a bugger of a tyre to change!

But yeah, your consumption seems high and I would be disappointed too.

[lc120_man Advanced Member Find all posts View Profile Close lc120_man]

Re: V6 fuel type and consumption

It would be good if there is some scientific way where we can conduct an experiment on a straight bit of flat road about 1km long...

Scangauge should be able to do that...
viewtopic.php?f=4&t=566

[hookedon4wding Advanced Member Find all posts View Profile Close hookedon4wding]

V6 fuel type and consumption

It would be good if there is some scientific way where we can conduct an experiment on a straight bit of flat road about 1km long...

Scangauge should be able to do that...
viewtopic.php?f=4&t=566

Anyone with a scanguage got a V6 150 and willing to give this a go?

[bertram35 Junior Member Find all posts View Profile Close bertram35]

Re: V6 fuel type and consumption

HI all,
I have petrol kakadu....love it!
Around Sydney with numerous small trips I am usually sitting at around 18l/100.
ML

Presume this is with the factory tyres? If so it kind of supports my disappointment.

I refuse to believe that changing from 265/65's to 275/65's will increase fuel consumption dramatically. It's only a 12mm increase in overall diameter.

As for weight, if adding slightly heavier tyres (what are they, maybe 5kg heavier per tyre?) increases fuel consumption by any significant amount then with 5 people on board (at say 70kg each) I would be lucky to get around the bock on one tank.

I would be surprised if adding the tyres has made any more than 1l/100km in total difference which still leaves a lot to get anywhere near the claimed consumption.

As for the cost for fuel, doesn't worry me, I'm happy to pay for the performance. It's the reduction in range (based on published figures) that annoys me. Looking at the brochures, road test etc, you would expect to comfortably get 1000km out of a tank (usable amount 140l and averaging 14l/100km) in the petrol on the road. I haven't broken 800km yet.

Cheers, Sam.

Sam,
Yes standard factory tyres and no mods to the car (ie no extra weight due to bull bars etc).
I agree that the real issue is range not cost.....shame they reduced tank from 180l down to 150l.
Can comfortably get well over 1000ks freeway driving.....up to 1300ks......but of course that's not where the range is important, it's when you are off raod in the middle of nowhere.
Does anyone know how Toyota calculate the usage - what is the "combined" based on?????
ML

[Hannon Lurker Find all posts View Profile Close Hannon]

Re: V6 fuel type and consumption

It would be good if there is some scientific way where we can conduct an experiment on a straight bit of flat road about 1km long...

Scangauge should be able to do that...
viewtopic.php?f=4&t=566

Anyone with a scanguage got a V6 150 and willing to give this a go?

Hi guys, I'm pretty sure babying the car is worst than accelerating at a decent rate and then staying at cruise speed in terms of fuel consumption. I don't own a prado, in fact I have a small BMW. The bimmer's owner's manual actually says "quickly accelerate to the desired speed and then maintain cruise speed" in the "tips" section of the manual.

I made a little test too. On a straight bit of flat road about 2kms long, I first tried babying the car until I reached 80km/h and then mantained that speed. Avg fuel consumption was 9.3lts/100km. After that, I did a reset to the onboard computer and did exactly the same experiment without babying the car. I accelerated with the gas pedal sort of half way down, quickly reached 80km/h and then mantained that speed. Avg fuel consumption was 7.3lts/100km.

I know it's not an exact test, but I think it makes sense. Not only the owner's manual says it, but also it is plausible in terms of "thermical efficiency" (sorry I didn't know how to say that, I'm not a native speaker). When you are babying your car, the engine works most of the time way away from it's "sweet spot", at a point in which it's not really thermically efficient. On the other hand, accelerating "normally" uses a little bit better your engine's torque and power curves, and then you reach quicker your cruise speed.

Hope it helps,
cheers!!

[najera2005 Lurker Find all posts View Profile Close najera2005]

Re: V6 fuel type and consumption

Hello,

Mine car Limited edition (Kakadu in Austrialia) do 14,2L/100, I think it`s pretty good for 4.0L gas on 2300Kgs.

Regards from Spain

[hookedon4wding Advanced Member Find all posts View Profile Close hookedon4wding]

V6 fuel type and consumption

Last few tanks have seen some long hwy driving and the average per tank has come down to between 13.6 and 14.5 which still includes some around town stuff. So, a little bit happier