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Batbaruman

Fuel economy in your Subaru

45 posts in this topic

Just thought I'd start a fuel economy topic as bit of banter about it in my thread. Please do mention your tank size so we can compare evenly, as someone has mentioned some use 50L tanks (like mine) where as most others use 60L.

 

Car : WRX STI 2001 (Bugeye)

Tuned (or stock?), any fuel system mods? : tuned, decapped pink sti injectors (not sure of flow) and bosche 044 fuel pump, split fuel rails too if that makes any difference.

Fuel : BP98

Fuel economy : 340 km on 50L tank mix of hard and casual driving, 400km total nana driving.

Fuelly stats if known :  with 2000km tracked on fuelly.com, my average is 7.3km per Litre, so 365km from a 50Litre tank of 98

 

 

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Car : Legacy GT-B 2007

Tuned Stock (running rich according to club day dyno)

Fuel : BP98

Tank: 55-60L(guessing, most i've squeezed in is about 52 litres)

Fuel economy : 450kms hard/casual drive, been getting 500-550 with 70% motorway, have hit 600Km with 85% motorway driving around auckland (botany to town and shore)

Fuelly stats if known : - 

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98 typeR

200 wkw

550 k's ...55 litres

3 kilometres to the litre at race speed..:)

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Car : Legacy 3.0R 2004

Tuned Stock (for now....)

Fuel : Gull Force 10

Tank: ~60L (guess based on fuel ups...)

Fuel economy : 11-14 l/100km crawling in AKL traffic, ~9l/100km on trip from AKL to Waihi.

Fuelly stats if known : - 

549943.png

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Car : 2005 BP9 outback (2.5l)

Tuned (or stock?), any fuel system mods? : Totally stock

Fuel : BP95

Fuel economy : about 9l/100kms mix of city driving and some 80/100k roads

 

Car : 1991 Legacy Rs RA

Tuned (or stock?), any fuel system mods? : TD05 turbo, V1/2 WRX ecu, not sure on fuel system

Fuel : BP98

Fuel economy : Average about 13- 15km/100km can be a lot less depending on how I feel like driving that day and whose in the car.

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Car: Legacy 3.0R 2006

Tuned: Stock 

Fuel:  Mobil / BP 98RON

Tank: ~64L

Fuel economy: OPEN 12.7km / litre (7.87litre / 100km), URBAN 7.4km / litre (13.5litre / 100km)
Tyre Pressure: 34psi all round

Edited by Teufel

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Car: 1999 BH5 GTB

Tuned: Stock 

Fuel:  Mobil / Gull Force 10

Tank: 50L 

Fuel economy: 400ish km to the tank with the odd spirited driving
 

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Car: 2002 Legacy EZ30 Sedan

Tuned: Reflash Tune (Stock ECU)

Fuel:  BP Ultimate 98 Octane

Tank: Unsure (50-55ish?)

Fuel economy: Guess-timates: OPEN 10km/L, URBAN 8km/L
Tyre Pressure: 34psi all round

 

Note: Will start using Fuelly to get more accurate results.

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Car: WRX STI 2003 

Tuned: 220kw tuned, 3 inch exahust, walbro fuel pump

Fuel: Gull 98

Fuel economy: 350 km on 50L tank mostly hard driving (weekend car) - 7km/L haha

 

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Car: 2001 STI

Tuned: Heaps. Holset Turbo and a Link, 1600cc injectors

Fuel: BP98

Fuel Economy: I can sneak 500kms out of it. Purely open road driving, only giving it jandle for overtaking really.

 

Flat out it will drink a little over 3L/minute.

 

Other car: 2005 Legacy 3.0R

Tuned: Nope

Fuel: BP98

Economy: I can get it to nudge over 12km/L on the open road, so I could probably get about 700km from a completely full tank (60L?)

Around town it's not flash.

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Car : WRX 2002 (Blob Eye)

Tuned Tuned. TD05, STi intercooler, silicone intake

Fuel : BP98

Fuel economy : Town: 375 and fuel light is on. Open road, haven't tried to see how far I can get.

Fuelly stats if known 

 

352243.png

 

Shouldn't complain really, but I wish it was better 

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Car :2005 3.0r spec b

Tuned Tuned. Vipec ecu, axle back exhausts 

Fuel : BP98

Fuel economy : Town: 500 and fuel light is on. Open road, 750km

Fuelly stats if known : 11.7l/100km average. 7.9l/100 best yet on a trip to Queenstown. 

 

Car : 2001 Impreza 1.5l

Tuned: stock as a rock

Fuel : 95

Fuel economy : Town: 650

Fuelly stats if known : 6.6l per 100km. Wife's car. 

 

Car : 1996 Impreza ej20e

Tuned: stock

Fuel : 95

Fuel economy : average 8.9l per 100

Fuelly stats if known 

 

Car : 1993 rally car

Tuned Tuned. Vf30

Fuel : gull e85

Fuel economy : cruising is 15l per 100km.flat out is 100l per 100km. 

Fuelly stats if known : why bother haha

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2 minutes ago, gotasuby said:

Car : 2001 Impreza 1.5l

Tuned: stock as a rock

Fuel : 95

Fuel economy : Town: 650

Fuelly stats if known : 6.6l per 100km. Wife's car. 

 

Car : 1993 rally car

Tuned Tuned. Vf30

Fuel : gull e85

Fuel economy : cruising is 15l per 100km.flat out is 100l per 100km. 

Fuelly stats if known : why bother haha

Lol best and worst fuel consumption winners right there :P

 

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Car : BC5 Legacy

Tuned Tuned. 280kw, Link

Fuel : BP98

Fuel economy : 250km to a tank mixed/hard driving (on road), will drink 1/4 tank in 30km hard driving

 

Anyone tried the closed loop lambda function on the links?

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Car : 92 Legacy RS

Tuned: Untuned and heaps of mismatch parts on it - running rich as F*** and performing averagely with gate always wide open so peoples ears hurt

Fuel : 95 / 98

Fuel economy : 350 max from a full tank (50L?)

Fuelly stats if known : Dont know what fuelly is but if you do 350/50 the answer is 7

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Car: WRX STI 2001 (Wagon) 

Tuned: Tuned:  211kw @416nm, 3 inch turbo back, Deatschwerks fuel pump

Fuel: BP98

Fuel economy: Around 360 km on 50L tank, mix of hard/casual driving - Just did a trip up North, about 420 km highway.

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20 hours ago, pl0x said:

Car : BC5 Legacy

Tuned Tuned. 280kw, Link

Fuel : BP98

Fuel economy : 250km to a tank mixed/hard driving (on road), will drink 1/4 tank in 30km hard driving

 

Anyone tried the closed loop lambda function on the links?

Mine was originally set up with closed loop; after the latest revision with the big honking turbo we ditched the O2 sensor and just went open loop all the time and I actually get better fuel economy so I don't think you're missing out on much.

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Who originally tuned the closed loop fuelling? You had Prestige tune it again recently didn't you?

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56 minutes ago, GC8E2DD said:

Who originally tuned the closed loop fuelling? You had Prestige tune it again recently didn't you?

It's probably more about the AFR targets/dither voltage, other wise it's just turning it on and setting gain/limits.

 

1 hour ago, boon said:

Mine was originally set up with closed loop; after the latest revision with the big honking turbo we ditched the O2 sensor and just went open loop all the time and I actually get better fuel economy so I don't think you're missing out on much.

Good info, cheers

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I've done closed loop quite a bit. But as boon said shouldn't make huge difference if open loop tuned correctly. My % in closed loop is always within 2% which is pretty good. Some tuners just guess the low load and use closed loop to get ok fuel economy and have massive corrections 

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Dont know size of fuel tank for mine and all that other stuff but:

2008 Subaru Impreza 2.0R

7.8L/100km when driving very carefully

15L/100km when driving hard

11.2L/100km is average

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awesome, this threads been really helpful to determine if i have a problem or not! so mines 12.5 L / 100km nana driving and 14.7L/100km driving hard, with an average of 13.7L / 100km mix driving which sounds about on par with other people that have similar cars.

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Car: 06 BP9 Outback 3.0R S I Drive (facelift) JDM

Tuned: Stock 

Fuel: 95  as recommended.

Tank 64 litres

Tyres; stock size  30 fr  28r  psi as recommended.

Fuel economy:  Worst: 7.5-8km / litre urban-short running)   13L/100km

Mixed running 35% short/ 65% open road 9,5km / litre.   10 L/100km

Open road  2-4hrs+  trip  11-13km / litre.  8 - 9 L/100km        (figures taken from trip computer and also set trip metre at each fill up to check)

Best  7.8 L/100km  Dunedin to Invercargill once - ideal conditions no traffic good weather Spring   @ 110kph

 

Reasons for good economy 3.0R tall overall gearing ie 3.27 diffs  100kph @ 2000rpm.   SI drive better for fuel economy - torque converter locks up sooner and engine power reduced in "Intelligent"  (economy) mode. (10% better than  non SI Drive 5EATs)

Its interesting watching the actual fuel consumption on trip computer  once open road and 80kph + fuel consumption improves a lot.

 

 

 

Edited by Stodart
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Car : 2002 WRX Bugeye Wagon

Tuned Stock with catless turbo back and big bore

Fuel : BP98 / Gull Force 10

Tank: 45L

Fuel economy: 600km to a Full Tank on Open roads, about 500km in everyday around town driving 

Fuelly stats if known : nil

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Car: 2001 WRX STI Bugeye

Tuned: 3Inch Full exhaust, intake, DW300 fuel pump, road tuned, 220kw @ wheels

Fuel: Mobil 98

Tank: 60L (i assume as when i fill up i put in about 53l of fuel and thats when the light isn't on either)

Fuel Economy: Daily driving with a bit of a burn here and there 440km and open road is 530ish

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