Thread: Post your Fuel Economy

It's basically all down to hub speed. If you have a larger rolling diameter for the same hub speed, the car will be going faster (points further out on a radius are going faster than points nearer the hub). The speedo will read lower than the speed the car is going. On the other hand if you have a smaller rolling diameter tyre for hub speed, the speedo will read too high.

Originally Posted by Horny_Devil

not sure if thats correct?

He knows what he means, just hasn't explained it very well. He's saying that no matter what wheel tyre combination you put on, the car will think it's going Z speed, even though it isn't.

Finally cracked the 600km on a tank mark, but i was really pushing it as you can tell by me putting 43L in when i filled up. The fuel light first flickered on at Rangiriri and was on pretty steadily from Pokeno and i got to the cbd in Auckland then back to my place before filling up. 90ish km from when it first flicked on

Model: 1993 Honda Civic
Engine: D15B Vtec civic hatch manual
Engine Mods: Stock
Fuel Type: BP 91
Tank Size: 45L
Driving style: 50/50 motorway/round town
Petrol used: 43.1L
KM traveled: 604km

only 14.04 km/L or 7.12L/100km though

Should really fix the miss and get it street tuned

Crowns latest reading:

BP 91.
3.0L 2JZGE Auto
1.8 tonne chassis?

6.5 km/L (15.4L / 100km?) around town with a solid foot... probably should ease up a bit, not to mention it needs a service.

And to think I'm contemplating a V8 Soarer...

K20A in EK4 with 205/50R15s was, from memory, a bit over 3600rpm in 6th. 6th gear overtaking uphill ftw.

6.9 Km / 1L
Nissan Presage
3.5L V6 VQ35DE

auckland and evening traffic and needs a service
Only planting it if accelerating to 100Km/h

so I guess not that bad considering it's technically an 8 seater!

Model: 1997 Ek9 Civic
Engine: B16b Manual
Engine Mods: I/H/E
Fuel Type: BP 95 and 98
Driving style: Motorway 110km/h with odd squirt for passing.
Conditions: 1 passenger. Boot and back seats packed choka-block.

Wgtn to Napier
Fuel: BP95
13.5KM/L
7.4L/100KM

Napier to Coromandal
Fuel: BP95
12.7KM/L
7.9L/100KM

Auck to Taupo
Fuel: BP98
12.9KM/L
7.8L/100KM

Taupo to Wgtn
Fuel: BP98
14.2KM/L
7L/100KM

Good economy out of a CTR

Man 4wd turbos suck some gas!

1989 CA3 accord B20A stock
Dash tells me 9km/Litre which is extremely gay!

Model: Holden HSV GTS
Year: 2010
Engine: 6.2 V8
Engine Mods: None
Fuel type: 95
Fuel tank size: 73L
L/100KM Open Road: 8-9L
Round town: 10-15L
Foot buried: 30 - 99L

Model: 2000 Honda Torneo Euro-R CL1
Engine Size: H22A 2.2
Engine Mods: No in-guard resonator, otherwise stock
Fuel Type: 98 Octane
Tank Size: 60ish L

Last fill was 9.3L/100KM | 10.8km/L

So already, on my second fill since owning it its cleanly beaten the BMW for economy. Thats with me giving the Torneo the usual "new car" thrashing.

Update:

Model: 1996 Holden Commodore Equipe
Engine Size: 3791cc
Engine Mods: Headers, exhaust, 255,000km of neglect.
Fuel Type: 91
Tank Size: Turns out it's 70l. Heh.

After replacing a few gaskets and hoses and cleaning a bunch of stuff up...
11.14l/100km round town, or 8.97km/l. Pretty awesome compared to what it used to get, which could be over 15l/100m. Haven't done an open road comparison yet.

Nice to have that much of an improvement - bet you're happy you put the effort in!

New Car

MODEL 2004 Subaru Legacy GT B4 sedan 5 speed Auto
ENGINE 2000cc Turbo
MODS All standard engine/car
FUEL BP 98 Gas
TANK 65 litres

Mostly open road = exactly 9L/100kms

Not bad for mixture of hills, flats and 3rd gear passing on way to twizel and back for long weekend

Originally Posted by BWDOWN

Just did a round town only record, almost to empty

Model: Civic EK9
Engine Size: 2000 B20Vtec
Engine Mods: Advanced Tuned 161kw Hondata S300j
Fuel Type: 98 Octane
Tank Size: 45L

14.33 KM per Litre or 6.97 Litres per 100KM. I did 645km on 45L

VERY Happy, thats pretty much 40 MPG

I drive my car everyday to work and back, mostly 50 and 60kph zones with a few 80kph straights thrown in...

Originally Posted by Horny_Devil

the best way to do it is fill the tank right up so you can see the fuel at the filler neck, then you know how much to put in next time. drive as far or as little as you like. fill up again to the same point you did it the first time then record the odo.

That is the best and most accurate way to measure how much fuel you have used. yes your odometer might be out but your only comparing it to your own readings. other peoples readings are only indications and are to be taken with a grain of salf

I tried Jase's method above as to me it seems the most accurate. So filled up on sunday arvo to the neck of the filler with 98 at BP. Drove to work and back Monday till today Wednesday and did 93.1Km to the dot. Filled back up and it took 6.20 Litres excatly the same part of the neck.

Now for the awesome results

Model: Civic EK9
Engine Size: 2000 B20Vtec
Engine Mods: Advanced Tuned 161kw Hondata S300j
Fuel Type: 98 Octane
Tank Size: 40L

15.02 Km per Litre or 6.66 Litres per 100Km.

Absolutely stoked with that!

1996 E39 528i 5 speed automatic, averaging 13.5L/100k around town the last 2 weeks (including a drive to Rolleston and back), worst economy observed, 14.1L/100k, I get stuck in a lot of traffic around town going to work and back now days due to many businesses from the CBD relocating to Addington, Riccarton, Middleton etc due to the quakes.
The economy doesn't bother me that much, its in my face on the onboard TV screen, which is the only reason I really take notice of it.

When I was using the Golf VR6 for work, (2.8L 4speed FWD VR6 automatic) i was averaging 11.8L/100k when I checked it.

might pay to chuck up all the details helps people more more sense of the numbers

Model:
Engine:
Engine Mods:
Fuel Type:
Tank Size:
Driving style:
Petrol used:
KM traveled:

Hmm I want to work out the economy of the Turbo CRX, but i'll need to start driving it, this is my usage for the last 16 months or so

Reading, Km	Date	Source or reason	Usage (avg), Km/day/year
199,850	2012, February 21st	WOF inspection	2.12/773
199,485	2011, September 2nd	WOF inspection	0.33/121
199,484	2011, August 30th	WOF inspection	1.72/626
199,121	2011, January 31st	WOF inspection
199,121	2011, January 31st	WOF inspection	0.76/275
199,090	2010, December 21st	WOF inspection	11.71/4,261

So oneday when I can start driving this beast I'll work it out, (damn quake damaged roads).

JZ30 Soarer
1JZGTE, 2.5L straight-6 twin turbo.
Automatic.
Stock engine, K&N intake.

Mostly sedate driving around town, don't go too hard on the boost. Put my foot up it onto the main roads a bit now and then.

8.4km/L