Fuel economy

[emax]

Overview Germany, selected: Diesel

Deutschland-Tankkarte in Echtzeit

benzinpreis.de

 

[ECrider]

Mine is running 33” tyres. So the speedometer is almost bang on accurate. Probably why I haven’t yet cracked 30 mpg.

me too

 

[trobex]

In the Gren on highway today at 110km set by cruise control (and it held that on the ODO for a while), my GPS gave me a reading of 110-111km - seems pretty accurate on these two scales.

 

[IG_in_AZ]

Don't move to NZ , esp petrol. West Coast today.

View attachment 7831205.

I saw gas on Interstate 10 between Phoenix and Tucson yesterday as low as $3.19 for unleaded. Should have filled up, as it's $3.49-$3.99 here. That's a US gallon, though, not a liter! Wow! At least the prices are slowly coming down, about 50c / gallon since summer.

 

[IG_in_AZ]

The Australian Design Rules

"The Australian Design Rules require that a vehicle’s speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 per cent plus 4 km/h.

This means that the vehicle’s true speed must not be higher than the speed indicated by the speedo. That is, at a true vehicle speed of 100km/h, the speedo must read between 100km/h and 114km/h. An alternative way to look at it is; at an indicated speed of 100km/h, the vehicle’s true speed must be between 86 km/h and 100km/h. Generally speaking, on modern cars the true speed is only a few km/h less that the indicated speed.

GPS speed readings can be accurate, but not always. It is therefore recommended that you use your vehicle’s speedo for consistency."

My experience on highways (as recent as last Thursday) is that most semi-trailers including B doubles travel right on the upper speed limit of the GPS.... and try to push you along to either increase yr speed or get out of the way.
I normally travel at the posted limit minus 5kmh...so I try to get out of their way....

There are, for the vast majority of drivers in the US, 2 camps, for highway driving. Most drive right at the posted speed limit, and the others, maybe 25% or more, drive at 9-10 mph over. Most cops give ~10 mph before stopping a driver for speeding, so that's the de facto speed limit. Posted 75 MPH, I usually set my cruise for 84.

 

[YellowLab]

I saw gas on Interstate 10 between Phoenix and Tucson yesterday as low as $3.19 for unleaded. Should have filled up, as it's $3.49-$3.99 here. That's a US gallon, though, not a liter! Wow! At least the prices are slowly coming down, about 50c / gallon since summer.

Wish it were that low in CA - still about $6.29 for low grade gas

 

[MurphyMurph]

@bemax thanks for clarifying. I always check the speedometer via GPS on a new vehicle and when I change tires to confirm accuracy. With 32” tires on my blue 1997 Land Cruiser it reads about 5% low (at 60mph indicated GPS shows 63mph). On my 2003 Land Cruiser with stock size tires it’s dead accurate GPS confirmed. Seems odd the Grenadier would be inaccurate out of the gate.

 

[DaveB]

@bemax thanks for clarifying. I always check the speedometer via GPS on a new vehicle and when I change tires to confirm accuracy. With 32” tires on my blue 1997 Land Cruiser it reads about 5% low (at 60mph indicated GPS shows 63mph). On my 2003 Land Cruiser with stock size tires it’s dead accurate GPS confirmed. Seems odd the Grenadier would be inaccurate out of the gate.

It isn't inaccurate, it is intentional.
Imagine if a vehicle manufacturer set a vehicle up to be 100% accurate
It would have to specify the tyre brand and size, amount of tread, perfect air pressure, weight in the vehicle. etc etc.
They build in a margin of error.
Your GPS nit probably has an accuracy of + or - 1-2% as well.

 

[Tazzieman]

I saw gas on Interstate 10 between Phoenix and Tucson yesterday as low as $3.19 for unleaded. Should have filled up, as it's $3.49-$3.99 here. That's a US gallon, though, not a liter! Wow! At least the prices are slowly coming down, about 50c / gallon since summer.

There are very few large petrol vehicles in these parts. And lots of small cars!
New Zealand is pretty remote but the roads are great...virtually no potholes. I presume they spend fuel excise appropriately.

 

[alvan]

Overview Germany, selected: Diesel

Deutschland-Tankkarte in Echtzeit

benzinpreis.de

Same in Italy as in Bayern...

 

[MRO]

Now almost 7,000 miles. 70mph gives 25.5mpg, 80-85mph 22mpg. Local roads and shorter distances 20-26mpg. Diesel Trialmaster. Usually fairly light load and sensibly driven.

My suspicion is that the KO2 tyres give at least a 10% fuel penalty over the standard tyres, as well as being noisier, and less precise on the motorway. They are great off road but I suspect the standard tyres aren't too bad. Considering a set of standard tyres, at least for the summer.

Has anyone directly compared the two?

 

[DenisM]

Now almost 7,000 miles. 70mph gives 25.5mpg, 80-85mph 22mpg. Local roads and shorter distances 20-26mpg. Diesel Trialmaster. Usually fairly light load and sensibly driven.

My suspicion is that the KO2 tyres give at least a 10% fuel penalty over the standard tyres, as well as being noisier, and less precise on the motorway. They are great off road but I suspect the standard tyres aren't too bad. Considering a set of standard tyres, at least for the summer.

Has anyone directly compared the two?

In our part of the world... the road and traffic authorities doesn't normally relate the words "sensibly driven" with 80-85mph.... (130-138 kmh)... depending on the open road limit (100kmh or 110kmh) exceeding the posted limit from 20kmh-40+ kmh can set you back anywhere between several hundred dollars to over $1,000 plus numerous points loss....
So, I'll take your word for it!

I believe you are on the money regarding the fuel economy penalty of the K02 tyres... probably closer to 15% ... or $.0.30 /litre at current Aus. prices...

 

[Tom109]

My suspicion is that the KO2 tyres give at least a 10% fuel penalty over the standard tyres, as well as being noisier, and less precise on the motorway. They are great off road but I suspect the standard tyres aren't too bad. Considering a set of standard tyres, at least for the summer.

Has anyone directly compared the two?

This is why I spec'd the standard 'stones on my Grenadier, and also why I decided $700 for the KO2 was wasting money. I have tried KO2's, sold them early, and never again. They do not do well in my traction-challenging conditions. My Gren is in production now. I plan to use the 'stones through next Summer for mostly road duty, then I'll swap for an aggressive 33" tire for Autumn/Winter trips.

 

[bemax]

It’s quite easy to see in the configurator. There it’s possible to see the co2 footprint of the specific configuration. Changing the tyres makes a big difference! Therefore in countries with co2 related taxes it’s not the best choice to take the rougher tyres when purchasing the car (as a non commercial car). It’ll bring you some significant tax disadvantages over the following years.

 

[trobex]

I saw gas on Interstate 10 between Phoenix and Tucson yesterday as low as $3.19 for unleaded. Should have filled up, as it's $3.49-$3.99 here. That's a US gallon, though, not a liter! Wow! At least the prices are slowly coming down, about 50c / gallon since summer.

And here in Aus they went up 30c in 3 months!

EDIT: PER LITRE!!!

 

[trobex]

In our part of the world... the road and traffic authorities doesn't normally relate the words "sensibly driven" with 80-85mph.... (130-138 kmh)... depending on the open road limit (100kmh or 110kmh) exceeding the posted limit from 20kmh-40+ kmh can set you back anywhere between several hundred dollars to over $1,000 plus numerous points loss....
So, I'll take your word for it!

I believe you are on the money regarding the fuel economy penalty of the K02 tyres... probably closer to 15% ... or $.0.30 /litre at current Aus. prices...

30km over is loss of license in QLD, you get out of car, lock the door and walk away with someone else having to drive it home. Then you beg the magistrate to give you a 1-point working license.

 

[beanohallett]

Did that figure come from the truck's computer, or did you do the math (ie full tank, drove Xmiles, filled again, divided miles by fuel)?

Hi matey that was a maths one, full tank to full tank [ 3 clicks on the pump] and then the distance on the run from the petrol station to petrol station on the sat nave, Its about the best I could come up with without using the onboard equipment but to be honest the odometer was only .8 of a mile different . hope this helps?

Mind you now post software update will have to see if thats made any difference evidently its ment to improve fuel consumption slightly as its a smoother power delivery now

 

[Krabby]

Hi matey that was a maths one, full tank to full tank [ 3 clicks on the pump] and then the distance on the run from the petrol station to petrol station on the sat nave, Its about the best I could come up with without using the onboard equipment but to be honest the odometer was only .8 of a mile different . hope this helps?

Mind you now post software update will have to see if thats made any difference evidently its ment to improve fuel consumption slightly as its a smoother power delivery now

Thanks for the reply - I'm trust my own math more than the car's if I'm honest. That way there's no questions about sensors, DTE, etc.

 

[JohnHeagney]

The computer over reads by about 4%, these are my recent stats:

Date	Miles	Litres	Cost	Gallons	Miles	Computer	Actual MPG	Computer error MPG	Computer error MPG %	Price per Ltr	Cost per mile	Miles per litre
23/08/2023	5660	50.03	£ 74.99	11.01	192	18.2	17.45	0.75	4.3%	£ 1.499	£ 0.391	3.84
24/08/2023	5915	63.95	£ 94.58	14.07	255	18.7	18.13	0.57	3.2%	£ 1.479	£ 0.371	3.99
28/08/2023	6168	70.00	£ 124.53	15.40	253	17.2	16.43	0.77	4.7%	£ 1.779	£ 0.492	3.61
31/08/2023	6432	68.36	£ 102.47	15.04	264	18.3	17.56	0.74	4.2%	£ 1.499	£ 0.388	3.86
05/09/2023	6685	62.32	£ 94.66	13.71	253	18.9	18.46	0.44	2.4%	£ 1.519	£ 0.374	4.06
12/09/2023	6940	69.27	£ 103.84	15.24	255	17.4	16.74	0.66	4.0%	£ 1.499	£ 0.407	3.68
22/09/2023	7174	66.96	£ 103.12	14.73	234	16.8	15.89	0.91	5.7%	£ 1.540	£ 0.441	3.49
02/10/2023	7379	56.17	£ 88.69	12.36	205	17.1	16.59	0.51	3.1%	£ 1.579	£ 0.433	3.65
04/10/2023	7604	58.66	£ 91.45	12.90	225	18.0	17.44	0.56	3.2%	£ 1.559	£ 0.406	3.84
11/10/2023	7856	69.52	£ 107.69	15.29	252	17.3	16.48	0.82	5.0%	£ 1.549	£ 0.427	3.62
17/10/2023	8121	69.41	£ 107.52	15.27	265	18.0	17.36	0.64	3.7%	£ 1.549	£ 0.406	3.82
25/10/2023	8427	74.83	£ 115.16	16.46	306	19.5	18.59	0.91	4.9%	£ 1.539	£ 0.376	4.09
30/10/2023	8692	64.94	£ 99.29	14.28	265	19.2	18.55	0.65	3.5%	£ 1.529	£ 0.375	4.08

 

[JonSutton]

Wish it were that low in CA - still about $6.29 for low grade gasView attachment 7831247

Reassuringly expensive. Almost approaching UK prices which today for me using diesel is circa $1.93 per litre = approx $7.31 per US gallon at exchange rate £1.00 = $1.21.