Fuel Economy

Bumpty · Post by **Bumpty** » Thu Dec 20, 2007 8:32 pm

I don't get how they do 1000 laps of the Mt on only... what two tanks!

Matatak · Post by **Matatak** » Thu Dec 20, 2007 8:58 pm

LOL who says its 1000 laps.

its nowhere near there. its around 1000ks which is however many laps that equals basically.

The Bigfella · Post by **The Bigfella** » Thu Dec 20, 2007 10:09 pm

150 or so laps (plus or minus 10 or so)

- my 35.5 was in a standard road car (chipped though - and it gets better economy than stock with the chip)

Smokey · Post by **Smokey** » Thu Dec 20, 2007 10:11 pm

166 laps from memory

Thalass · Post by **Thalass** » Thu Dec 20, 2007 10:37 pm

My 99 Outback (2.5L/5sp manual) gets an average of 480km per tank (which I thought was 55L, but according to the manual is 64L), which works out to an average of 9.454km/L or 10.616L/100km. I get better economy on premium fuel, but it costs pretty much the same per km.
Looking at my spreadsheet thingy here, my fuel economy has been going down. Started out at 10.163km/L, and the last entry is 8.809km/L.

I think I'll have to start driving more sensibly... :P

SUBYDAZZ · Post by **SUBYDAZZ** » Fri Dec 21, 2007 1:20 pm

liberty99GX wrote: yes, same here: from filling up till the fuel nozzle clicks off and filling up again when the reserve light's coming on I get a maximum of around 40 L into my '99 Liberty wagon, auto. And the manual says it's got a 64L tank. I haven't driven it dry yet, but it's bothering me a bit having to fill up all the time. Where do the missing 25 L go (after all, it's more than a third of the nominal tank volume)...

You don't have to keep filling it up, it's not empty! The other 24L is still in there, it hasn't gone anywhere. The reserve on most Subaru models is usually between 10-25% of a full tank capacity, ie, when the gauge shows empty, there is a reserve capacity left (so you don't run out of fuel). This can mean there are potentially hundreds of km of mileage still available. Fuel gauges are notoriously inaccurate at the best of times. Most Liberty tanks are 60L, though some later were 64L. Owner's manual will tell you. The low fuel light will also trigger at different levels remaining. In my Impreza for example it is supposed to come on when there are 9L left (15%), yet I can fill up and get only 45L (75%) in when it first lights up on occasion. It is designed so whenever it reaches that level the light stays on. If the fuel is sloshing around it is easy to see how it thinks there is only 9L left, but there can be substantially more. Probably the best way to gauge what you have left is to always fill the tank, reset the trip-meter and know how the way you've been driving it effects consumption. I know with my Liberty that on an average driving sort of tank I NEED to get fuel just over the 500km mark. If I have driven pretty grandma-like I can get to just under 600km before I will run dry. If I have flogged the car I have run out with under 450km on the tank. This all comes from experience. I have run dry more times than I care to remember also, but almost always knew I had to get to a servo fast!

I just try and stretch out the km on each tank to get my average km/tank stats high which is often my downfall (+ when Sarah sits in car for extended periods idling with A/C on)

As for consumption to expect from EJ22, my 92 AWD wagon averages just over 10.5L/100km all told. Best is rare to get below 9L/100km and worst is in the 14+L/100km range. Mileage is worse on PULP. Average consumption has dropped from about 10.3 over the past 6 years and 210,000km - to be expected. Unfortunately fuel price has also increased by 50%.

SUBYDAZZ · Post by **SUBYDAZZ** » Fri Dec 21, 2007 2:19 pm

Why is my messages going weird, I cannot click on the options in the advanced editor either?

Thalass · Post by **Thalass** » Fri Dec 21, 2007 3:52 pm

One of these days I'm going to have to test out exactly how far I can go, and how much fuel I can fit in the tank. I always thought it was 55L, and I usually drive for a day or so with the light on, but the workshop manual says it's 64L.

After the baby is born I'll go around with a jerry can for a week or so untill I splutter to a stop. Can't do it before hand, I'll be in trouble if it runs out on the way to the hospital! :P

*edit*

Wow... that's alot of entries! Nearly six years worth! My spreadsheet has six whole entries! Though the car was off the road for a while, so there's a bit of a hole there.

SUBYDAZZ · Post by **SUBYDAZZ** » Sun Dec 23, 2007 10:54 am

Thalass wrote: Wow... that's alot of entries! Nearly six years worth! My spreadsheet has six whole entries! Though the car was off the road for a while, so there's a bit of a hole there.

Thanks, I like to keep data. It's useful for stuff. I am the petrol data master.

Matt · Post by **Matt** » Thu Dec 27, 2007 8:00 pm

I set a new record on my recent trip down to the sunny coast in my slightly (read heavily modified) Brumby. I averaged 8L / 100km the whole way from townsville to the sunny coast! i was not hunging around sitting on the speedlimit with a light to medium load.
My ute still has a modified EA81 (Dual ports, cam, unifiter, snorkel and 2" exhaust)

steptoe · Post by **steptoe** » Fri Dec 28, 2007 3:45 pm

L Series 3sp auto RX (GLTA) EA82 Turbo has just got me home at 537 pretty true kilometers (if not precise - highway and puttering and blat,blat turbo demo's

)). AT 530 it gave a hiccup on a downward slope and in the drive the fuel pump has gone noisy so I'd say I am close to getting 11litres for 100km out of my 60 litre tank. If it was all flat - how much further I dunno. All for getting empty to remove to install LPG cylinder in boot - tank is in the way of drill bit and bolts !

SUBYDAZZ · Post by **SUBYDAZZ** » Sat Dec 29, 2007 11:30 am

steptoe wrote:L Series 3sp auto RX (GLTA) EA82 Turbo has just got me home at 537 pretty true kilometers (if not precise - highway and puttering and blat,blat turbo demo's )). AT 530 it gave a hiccup on a downward slope and in the drive the fuel pump has gone noisy so I'd say I am close to getting 11litres for 100km out of my 60 litre tank. If it was all flat - how much further I dunno. All for getting empty to remove to install LPG cylinder in boot - tank is in the way of drill bit and bolts !

Ah, but how do you know how much you've used unless you fill it to the brim again!

That mileage ain't bad either way. Say there's not much left

steptoe · Post by **steptoe** » Sat Dec 29, 2007 9:54 pm

I glad you asked (in a Curisoty Show kind of way, or was that Julius Sumner-Miller?) I have precisely 20 litres in a jerry (in the boot for last days) - that went in without a drop spilled then off to the servo for another 35.6 litres , a little past the click on gentle speed - not want to drown charcoal cannister ! So 55.6 litres ! If you wanna get the last 4.5 litres DRIVE UP HILL coz it sucks from the back end of the tank i think. 540 km eh, to do the same in me LPG Brumby is about 70 litres at 57.9 V's 145.9. Now the 57.9 just gone to 72.9 !!!

SUBYDAZZ · Post by **SUBYDAZZ** » Sun Dec 30, 2007 9:02 am

Smokey wrote:166 laps from memory

Not sure what track we're talking about here, as I saw a Witnon and a "Mt". If it's Mt Panorama it is 161 laps as it is 6.213km in the current configuration. It should really be called the Bathurst 1000.293!

SUBYDAZZ · Post by **SUBYDAZZ** » Sun Dec 30, 2007 9:06 am

I once put 61.1L in my L-Series. It was starting to miss and rolled into the servo. I've a feeling it was either really empty or the servo may have had their pump calibrated to get that little extra for the owners!

steptoe · Post by **steptoe** » Sun Dec 30, 2007 7:51 pm

and did I mention I was waiting to see when the orange warning light would come on ? It didn't

Bathurst was 163 laps until Conrod Straight got bent

The moral looks to be for me anyway if I don't enjoy a walk lugging petrol - 500km and fill up

SUBYDAZZ · Post by **SUBYDAZZ** » Mon Dec 31, 2007 5:53 am

Yeah, I found out in the first week with my Liberty that the low fuel light was U/S too.

steptoe · Post by **steptoe** » Fri Jun 20, 2008 1:40 pm

Just ran out of fuel on purpose in my 92 Brumby with the rebored 1.0mm, totally rebuilt, 20/60 cammed EA81, heads shaved twice now! The previous owner, my uncle reckoned he'd run out at 500km on the old donk [serving time in my 84 ute] I later find timing set at about 2 degrees BTDC. With highway running in procedures in place - foot flat to the floor up hills but not over revving it, some town travel and some 4WD pace.

I have checked speedo accuracy with GPS and odometer on highway check posts all very close readings.

I got 609km out of the tank. I have no intention to refill it as I have finished my ring bed-in driving on petrol so will chuck the LPG manifold and mixer (gas carb) on in next few days

Previous measures I was getting 8.75 to 9.0 litres per 100km. It is a std Brumby tank. Just how big is it? I reckon 60 litres . There are some Brumby owners gonna be wondering. I knew that my 84 Brumby would last me to 600km with twin carbs and 16/56 cam

SUBYDAZZ · Post by **SUBYDAZZ** » Fri Jun 20, 2008 2:51 pm

Brumby may be 55L, though I'm not 100% sure.

Matatak · Post by **Matatak** » Fri Jun 20, 2008 6:53 pm

55 L i should also think.

i no thats what mine is