Fuel economy

MRO · Oct 31, 2023

DenisM said:
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...

Thanks. I have done many thousands of miles in Australia and, even with a UK license, speeding is out. The UK can't afford many motorway police any longer and fixed and mobile speed cameras are well flagged on Waze. Of course my 80-85mph was on the continent where it is legal for any of the authorities reading this. FWIW my previous SDV8 Range Rover would do 38mpg at 85mph on Grabber ATs.

DenisM · Oct 31, 2023

MRO said:
Thanks. I have done many thousands of miles in Australia and, even with a UK license, speeding is out. The UK can't afford many motorway police any longer and fixed and mobile speed cameras are well flagged on Waze. Of course my 80-85mph was on the continent where it is legal for any of the authorities reading this. FWIW my previous SDV8 Range Rover would do 38mpg at 85mph on Grabber ATs.

Yep! a few years ago in Australia some wag entered a V8 diesel Range Rover in a well publicised fuel economy event where it was competing against petrol and hybrids. Based on a formula which took gross weight and raw consumption figures into account, the diesel Rangie ran away with several "1sts"

. Lots of red faces in the greenie camp and excuses but he proved the point!! I suspect the comparatively streamlined shape of the RR and its (lesser) weight are significant in its excellent fuel consumption figures. I was very tempted to buy a second hand "full fat"RR TDV8 at one stage.... but I don't have a big shed!

Tazzieman · Nov 1, 2023

The World Bank suggests that with the middle east war , crude oil prices could rise 75%
Long distance travel might become a luxury item for many.

emax · Nov 1, 2023

Tazzieman said:
The World Bank suggests that with the middle east war , crude oil prices could rise 75%
Long distance travel might become a luxury item for many.

That's the wet dream of the oil companies, the Arabs and a lot of planet-rescuers.

AMD66 · Nov 1, 2023

IG_in_AZ · Nov 1, 2023

Tazzieman said:
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.

And here, our roads, particularly Interstate 10 between my home and Tucson, are getting really bad, with ruts from the heavy trucks and cracks with the roads literally disintegrating from the summer heat, winter freeze and monsoon rains. They are working on sections of road, but it's a slow process. We may have the most roads, but they aren't the best! I'm sure the ride in my Grenadier will be better than my Kia on the rough spots.

255/85 · Nov 3, 2023

JohnHeagney said:
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

Yeesh. Assuming you're reporting in Imperial gallons then MPG is not looking great for North America.

FlyingTexan · Nov 3, 2023

AMD66 said:
View attachment 7831441

I'm going to guess this is the hydrogen variant, in ice cold temps, at sea level using US gallons?

FlyingTexan · Nov 3, 2023

255/85 said:
Yeesh. Assuming you're reporting in Imperial gallons then MPG is not looking great for North America.

was thinking the same

AnD3rew · Nov 3, 2023

trobex said:
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.

Mine is 114 on cruise = 110 on gps. 104-105 on cruise is 100 gps

JohnHeagney · Nov 3, 2023

255/85 said:
Yeesh. Assuming you're reporting in Imperial gallons then MPG is not looking great for North America.

Yes, my readings are Imperial gallons - but you pay much less for fuel compared to us over here even considering the American gallon difference!

Tom109 · Nov 3, 2023

255/85 said:
Yeesh. Assuming you're reporting in Imperial gallons then MPG is not looking great for North America.

I only purchased my 2003 1.9l VW TDI based on MPG. Everything else I did’t even bother to look. If we had a Canning Stock Route I would probably pay more attention.

255/85 · Nov 3, 2023

JohnHeagney said:
Yes, my readings are Imperial gallons - but you pay much less for fuel compared to us over here even considering the American gallon difference!

Not entirely true. We pay for it in tax subsidies and mideast wars.

Tom109 said:
I only purchased my 2003 1.9l VW TDI based on MPG. Everything else I did’t even bother to look. If we had a Canning Stock Route I would probably pay more attention.

Good for you! Oh, to have the luxury to not notice prices or mpg.

Tom109 · Nov 3, 2023

255/85 said:
Good for you! Oh, to have the luxury to not notice prices or mpg.

I also don't live in CA (although I do travel there for work - painful pricing for sure). Heck, in NJ we are not allowed by law to pump our own fuel and it still cost less than PA next door!

trobex · Nov 7, 2023

After a week of driving, with roughly 60% highway travel, I am averaging on my last few daily trips at 10.3-10.5L / 100kms. Right on the SPEC sheet number! That is also not taking the Gren over the 110km/hr mark!

JohnHeagney · Nov 8, 2023

I ran my tank “dry” theoretically having been through the Amber and Red warnings, and then did another 12 miles when it stopped reporting - and was only able to add 80.87 litres when the tank capacity is 90 litres. Anyone’s view if the tolerances are set too cautiously? Thanks, John

Tinki · Nov 8, 2023

JohnHeagney said:
I ran my tank “dry” theoretically having been through the Amber and Red warnings, and then did another 12 miles when it stopped reporting - and was only able to add 80.87 litres when the tank capacity is 90 litres. Anyone’s view if the tolerances are set too cautiously? Thanks, John

One. Theory on this is that when off-roading you are not always level so they need enough fuel in the tank after the red warning so the car does not cut out despite the position . ( had it happen in my patrol ) this is the only reason i can think of them doing it this way .

Another observation the Gren economy gauge tops at 30L/100km under full acceleration. Once hitting its top speed it will do 25-26L/100km (been told by a friend in Mexico) . Not sure how accurate that is . This is where we need the scientists who live in Germany to investigate on the Autobahn.

JohnHeagney · Nov 8, 2023

Tinki said:
One. Theory on this is that when off-roading you are not always level so they need enough fuel in the tank after the red warning so the car does not cut out despite the position . ( had it happen in my patrol ) this is the only reason i can think of them doing it this way .

Another observation the Gren economy gauge tops at 30L/100km under full acceleration. Once hitting its top speed it will do 25-26L/100km (been told by a friend in Mexico) . Not sure how accurate that is . This is where we need the scientists who live in Germany to investigate on the Autobahn.

I ”get” the off reading reason for caution!

Jean Mercier · Nov 8, 2023

JohnHeagney said:
I ran my tank “dry” theoretically having been through the Amber and Red warnings, and then did another 12 miles when it stopped reporting - and was only able to add 80.87 litres when the tank capacity is 90 litres. Anyone’s view if the tolerances are set too cautiously? Thanks, John

After running dry like you said, I usually can still drive 50km, and still am able to fill only around 86 liter. Therefore, yes, the warning is too early.

FlyingTexan · Nov 10, 2023

JohnHeagney said:
I ran my tank “dry” theoretically having been through the Amber and Red warnings, and then did another 12 miles when it stopped reporting - and was only able to add 80.87 litres when the tank capacity is 90 litres. Anyone’s view if the tolerances are set too cautiously? Thanks, John

On the drive with Stu they said the computer becomes more accurate with time. If you don’t have a diesel and have the balls I say run it dry a couple times.

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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