Petrol VS diesel?

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27th August 2019, 07:32 PM
Vern

Quote:

Originally Posted by DoubleChevron

20-25 is a big range. I'm guessing 25L/100.... which is about right I would imagine for any modern petrol engine. The modern diesels seem to be returning ~ 15L/100 under similar conditions (unless you compare to the most inefficient deisels ... eg: the V8 cruiser diesel).

I'm not bagging the petrol, I'd rather a V8 petrol anyday myself. But while they use 30->50% more fuel than a diesel they will still be around.

I'm always amused us petrol owners always claim the best possible fuel economy. Its like the Range Rover Classic owners claiming they can get 14-16L/100 out of there classics. This maybe possible on a gentle highway run... not towing. I have NEVER done this sort of driving .... ever ... in the 5years I've probably been running one. its either lots of cold starts around town, offroad work .... or towing big chunky things along they highway. I'm guessing I average 30L/100 around town and much more towing on the highway. A diesel doing the same work would be half of that ( the cold starts don't effect diesels economy much, and when they are working hard, they don't drink like a drunk :D ).

If you do a lot of highway cruising not towing without the cold starts. The modern petrol motors can return great fuel economy ... This certainly doesn't match my use though :(

Majority are 21-23, I was just rounding down and up[emoji6]. Best I could get from our diesel amarok was 14L towing the same camper, but without the boat, and wouldn't sit on the speed limit anywhere as easy as the patrol does.
27th August 2019, 07:51 PM
jonesfam

I don't care.
I like driving diesels & will continue to do so until I drop off this mortal coil!
Jonesfam
27th August 2019, 10:18 PM
DoubleChevron

Quote:

Originally Posted by scarry

Not many,if any modern diesels will do 15l/100km pulling 3.5T, on the speed limit.

Thats definitely a pipe dream.

Who on earth would be insane enough to tow at the speed limit. I travel at 80->90km/h depend on prevailing conditions. Travelling at 90km/h would be a very rare event. the only people I ever see towing at the speed limit are the grey nomads with there jacked up ridiculous 3.5+ton monstrosities .... I'd say to the boss women "Here comes another bloody nomad". I lift off the accellerator and start applying the caravan brakes at the controller and move over as far as I can ................ And they come bloody hurtling past. Almost always without fail .... they get about level with my drivers door and you can see there caravan starting to walk ......... by the time they are past me there all over the bloody road .... barley in control of the bastard (how most of them don't die I have no idea). Sometime they panic and slam the brakes on it front of you ..... and next thing your up there arse doing 80km.h when previously you were travelling at 85->90km/h. don't worry though, within 5minutes they have forgotten they nearly died ... and there off again at 100km/h to try and take out the next person. We struck this again and again. I honestly don't think they understood how close to the absolute outside of there safety envelope they were travelling.

I'm never amazed when I see another news story where they are sweeping up the remains of another 'van from the side of the road.

seeya,
Shane l.
27th August 2019, 10:19 PM
DoubleChevron

Quote:

Originally Posted by jonesfam

I don't care.
I like driving diesels & will continue to do so until I drop off this mortal coil!
Jonesfam

I prefer big petrol ... or turbo petrol motors ..... WWWWWWWWWhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeee ...... it sucks having to feed them though :(
28th August 2019, 10:23 AM
Tombie

Shane, I tow at the speed limit.
My combination is perfectly stable well above posted speeds in most conditions.

I reduce speed only if road surface or atmospheric conditions are impacting stability.

A well balanced combination will safely tow at 100km/h

If it can’t be, it isn’t a good combination and shouldn’t be running on the road.
28th August 2019, 11:32 AM
goingbush

Quote:

Originally Posted by DoubleChevron

Who on earth would be insane enough to tow at the speed limit. I travel at 80->90km/h depend on prevailing conditions. Travelling at 90km/h would be a very rare event. the only people I ever see towing at the speed limit are the grey nomads with there jacked up ridiculous 3.5+ton monstrosities .... I'd say to the boss women "Here comes another bloody nomad". I lift off the accellerator and start applying the caravan brakes at the controller and move over as far as I can ................ And they come bloody hurtling past. Almost always without fail .... they get about level with my drivers door and you can see there caravan starting to walk ......... by the time they are past me there all over the bloody road .... barley in control of the bastard (how most of them don't die I have no idea). Sometime they panic and slam the brakes on it front of you ..... and next thing your up there arse doing 80km.h when previously you were travelling at 85->90km/h. don't worry though, within 5minutes they have forgotten they nearly died ... and there off again at 100km/h to try and take out the next person. We struck this again and again. I honestly don't think they understood how close to the absolute outside of there safety envelope they were travelling.

I'm never amazed when I see another news story where they are sweeping up the remains of another 'van from the side of the road.

seeya,
Shane l.

I also regularly tow at the speed limit, if the road conditions allow, that goes without saying 110kph on the freeway. Be it towing the car trailer or the caravan. And also worry about the grey nomad thing.

If you don't go beyond 80-90 kmh for fear of uncontrolled sway then you should not be towing at all. Its about correct loading and weight distribution, and tug / trailer mass ratio. .

The problem is the unregulated caravan industry, lack of driver training and ridiculous overweight top heavy caravans being towed by ridiculous undersize vehicles that should never be tow plated at 3500kg.
28th August 2019, 11:59 AM
Homestar

I tow at speeds safe for the conditions. While my 50 year old van tows fine at any speed up to 100KPH and has its weight distributed well and doesn't sway or even feel like it wants to, I do drop the speed off on some secondary roads or roads that aren't in great condition - this is more to do with looking after a flimsy 50 year old chassis that I want to make last quite a bit longer. It's not in bad condition, just build very light weight compared to modern monstrosities so my lower speeds are due to looking after my gear than for fear of it slinging me off the road.
28th August 2019, 01:26 PM
scarry

Quote:

Originally Posted by DoubleChevron

Who on earth would be insane enough to tow at the speed limit. I travel at 80->90km/h depend on prevailing conditions. Travelling at 90km/h would be a very rare event. the only people I ever see towing at the speed limit are the grey nomads with there jacked up ridiculous 3.5+ton monstrosities .... I'd say to the boss women "Here comes another bloody nomad". I lift off the accellerator and start applying the caravan brakes at the controller and move over as far as I can ................ And they come bloody hurtling past. Almost always without fail .... they get about level with my drivers door and you can see there caravan starting to walk ......... by the time they are past me there all over the bloody road .... barley in control of the bastard (how most of them don't die I have no idea). Sometime they panic and slam the brakes on it front of you ..... and next thing your up there arse doing 80km.h when previously you were travelling at 85->90km/h. don't worry though, within 5minutes they have forgotten they nearly died ... and there off again at 100km/h to try and take out the next person. We struck this again and again. I honestly don't think they understood how close to the absolute outside of there safety envelope they were travelling.

I'm never amazed when I see another news story where they are sweeping up the remains of another 'van from the side of the road.

seeya,
Shane l.

Where i can,i tow at the speed limit.

i am not going to hold people up,where there is no reason not to tow at the speed limit.

Fuel economy doesn't worry me,if it costs $3.00 an hour more to get somewhere,who really cares?
28th August 2019, 05:46 PM
DoubleChevron

Its good to know I'm still pretty much always wrong .....

https://www.carsales.com.au/editoria...review-112390/

Surprisingly light on fuel

The surprise came when towing the Jayco on a 100km/h freeway and highway loop, including a hill climb and clearing some traffic to get out of the suburbs. The average was 20.8L/100km after tank-to-tank fills. Nissan appears to have done something to the Patrol’s tuning to peg back fuel consumption.
Surprisingly light on fuel

How on earth does does a petrol V8 towing a silverline (really heavy things they are) return that sort of fuel economy :eek:
28th August 2019, 06:45 PM
scarry

Quote:

Originally Posted by DoubleChevron

Its good to know I'm still pretty much always wrong .....

https://www.carsales.com.au/editoria...review-112390/

Surprisingly light on fuel

The surprise came when towing the Jayco on a 100km/h freeway and highway loop, including a hill climb and clearing some traffic to get out of the suburbs. The average was 20.8L/100km after tank-to-tank fills. Nissan appears to have done something to the Patrol’s tuning to peg back fuel consumption.
Surprisingly light on fuel

How on earth does does a petrol V8 towing a silverline (really heavy things they are) return that sort of fuel economy :eek:

Good engineering i suppose.

The D3/4 petrol V8's were also pretty good on fuel,but there are not many around,and most if not all were HSE.

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