2.5 Fuel Economy

Posts specific to the 2.5 litre NA engine

Re: 2.5 Fuel Economy

Postby Clearlight » Thu Feb 11, 2016 2:41 am

I struggle to get better than 9 litres per hundred around town , often in slow traffic and lots of cold starts its more like
11 litres per 100 . On the highway its happier times , usually in the sevens . One time last winter , I got down to 6.3 per
100 cruising at 1?0 kph with the air off , running on Shell Optimax . Unfortunately that speed seems to coincide with an
efficient rpm band , but at 100 k its actually using more fuel for some reason .
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Re: 2.5 Fuel Economy

Postby Callicil » Mon Nov 27, 2017 2:47 pm

I'm seeing some nice numbers here. Shame I can't get the same out of my 2.5i. First run with it from about 3/4 tank netted me just under 300km. Second run is looking a bit more promising at this stage.
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Re: 2.5 Fuel Economy

Postby robo498 » Tue Nov 28, 2017 7:38 am

2 things, 1 maybe your o2 sensor is on the way out & 2 speak to Matt from kido tuning and get him to tune the car, I have a 2.5 stock non turbo wagon and was getting 400 kms from a tank, it has gone up to 500 kms (city) now and much better still on the highway. :D
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Re: 2.5 Fuel Economy

Postby Callicil » Tue Nov 28, 2017 9:18 am

Yeah not sure where Kido is located, but was thinking it was the MAF sensor, but still working out where exactly where it is. Not on the intake hose, so I'm thinking it's on the box over the carby. The second tank seems to be going a bit better at the moment. About a 1/3 through and it's on about 200km, so I'll see how it goes after I get it serviced on Friday.

I guess these are the joys of buying a second hand car ey?
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Re: 2.5 Fuel Economy

Postby robo498 » Tue Nov 28, 2017 5:21 pm

Use BP ultimate, subaru's love it. Kido is in Sydney, but then Matt goes all around australia and he will book you in and let you know when he is in town. ....Easy! As you have the Preface I am not sure where the MAF is, on mine it is on the hose from the in take air filter. But Matt can see from the computer if it is on the way out for you. Also he can make your brakes better and make the thermo fans come on sooner to help stop or slow down the leaking head gasket the 2.5's have. If you need matt's details let me know. Get the NGK plugs for the car well. Are you in Melbourne?
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Re: 2.5 Fuel Economy

Postby Callicil » Tue Nov 28, 2017 6:16 pm

Nah I'm all the way over in sunny WA. Was thinking of trying some of the injector cleaner also, as I reckon the car was sitting idle for a while before I bought it. Yeah googling where the MAF is on mine seems to be impossible to find ey. I'll see how it goes after a service, and then if it's still utter crap on fuel, I'll see if I can contact Matt and see what he can work out for me.
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Re: 2.5 Fuel Economy

Postby jamescd » Wed Nov 29, 2017 5:05 pm

Callicil, having an 04 2.5i you might have the untunable Hitachi ECU (just like me, yay)
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Re: 2.5 Fuel Economy

Postby Callicil » Fri Dec 01, 2017 11:48 am

Oh great that sounds absolutely wonderful. So far I have managed to go around 250km to half a tank. Slowly improving.

**Update - 08-12-2017**
Well it turns out the plugs and such had never been replaced. Melted plugs, dodgy leads, filthy filters. Problem solved.
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Re: 2.5 Fuel Economy

Postby Snekky » Wed Aug 15, 2018 4:45 pm

Mine says 25-30 Litres per 100 km, idk if somethings wrong with the system :?
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Re: 2.5 Fuel Economy

Postby Jaza » Sun Aug 19, 2018 9:08 pm

My 2008 Liberty wagon surprisingly got 655kms on a full tank to when the fuel light came on which was United U91 where I drove from Frenchs Forest NSW to Coffs Harbour NSW with a bit of city driving around Coffs Harbour. I notice a huge difference when I switch from U91 to P98 as I get more kms and more performance out of it. I'm going to try BP Ultimate for the first time this week and see how it goes.
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Re: 2.5 Fuel Economy

Postby Jaza » Sat Sep 01, 2018 6:26 pm

Fuel light has come on from using BP Ultimate for the first time and I'm amazed at what it's done. I've done 605kms on a full tank and it's the best P98 fuel I've used and it's the furthest I've gone on P98. I've noticed i've got more kms usually averaged around 570kms on other P98 fuels which were from United and Shell but BP Ultimate gave me better performance, faster acceleration and smoother driving. BP Ultimate is the best on Subaru's then Caltex Vortex is second best. So I'm happy about the fuel economy but i'll be back on U91 as PULP is an absolute rip off in Coffs Harbour averaging 175.9
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