Gas mileage mods (yes I used search) 01 legacy

averagebob · 01-17-2011, 10:25 PM

So what type of things can be done to increase gas mileage from the low 20's on a subaru legacy *or any subaru*

I have heard light weight flywheel (I do a lot of stop and go so this would help?) and light weight rims....

Any others? Engine mods included, links would be great to products. I have searched for subaru parts but come up with generic sites that are trash and only sell universal crap.

So right now I get about 25mpg when my Air sensor doesn't puke and throw a code

(its in the shop now for head gasket and timing belt next week it gets a new sensor) and I would like to add to that MPG significantly. My thoughts are

Light weight pulley set including flywheel
Light weight rims (alloy?)
Better intake ????
Better exhaust?????

I know tune up obviously but I'm looking for a little more in-depth.

Ohhey1 · 01-17-2011, 10:29 PM

The only thing on your list that will make a difference is lighter wheels and that will probably be so slight you won't notice it. In my opinion, too much money anyway. Buy a slower or lighter car. 25 mpg is good.

averagebob · 01-17-2011, 10:31 PM

Quote:

Originally Posted by Ohhey1

The only thing on your list that will make a difference is lighter wheels and that will probably be so slight you won't notice it. In my opinion, too much money anyway. Buy a slower or lighter car. 25 mpg is good.

Speaking of slower car do these things have Governors?. . . . . . If so I haven't hit one yet

So nothing would really make that big a difference?

auslyle · 01-18-2011, 02:10 AM

Quote:

Originally Posted by averagebob

Speaking of slower car do these things have Governors?. . . . . . If so I haven't hit one yet

So nothing would really make that big a difference?

you'll run out of power before you run out of gear no governors

renyo · 01-18-2011, 08:22 AM

I know my Impreza fuel cuts at around 112 (on the speedo at least).

averagebob · 01-18-2011, 11:35 AM

Quote:

Originally Posted by auslyle

you'll run out of power before you run out of gear no governors

Ahh

i see....

So no real way to increase gas mileage, Loose weight is about the only thing that would make a difference I think other than the rims like the guy above stated.

How about aluminum under body panels to lower drag? Low drag body kits???

Just throwing ideas out there maybe someone that knows will come by?

abgusaf · 01-18-2011, 12:24 PM

I would just save the money on everything but a tune, I had an aggressive tune on my wrx putting down between 310 - 320hp at the wheels, and i averaged about 21mpg. Thats both highway and city getting on it pretty regularly.

I bet you could get in the high 20's maybe 30mpg with a good tune

JoshP · 01-18-2011, 12:37 PM

All those things you listed will help with fuel mileage, so long as you dont change your driving style. 89 octane fuel will also.

GEE-OTTO · 01-18-2011, 02:35 PM

89 really? Why ?

A Light weight Fly wheel wont help you in low speed situations.
Lighter wheels maybe.
Engine mods for a Ej251 that will help: better air filter, keep ignition/fueling system fresh.

renyo · 01-18-2011, 05:01 PM

Quote:

Originally Posted by GEE-OTTO

89 really? Why ?

I think the idea is that the ecu can run better timing.

Quote:

Originally Posted by GEE-OTTO

A Light weight Fly wheel wont help you in low speed situations.

Why not? This will help the same way

Quote:

Originally Posted by GEE-OTTO

Lighter wheels maybe.

will help.

Bluefoton · 01-19-2011, 11:31 PM

Maintenance, and a brick under the gas pedal. The rest will hardly ever pay off.
Flywheel might help a little bit, take low-rolling resistance tires when you change them, overinflate them by a few Psi, drop some weight...

formula91 · 01-20-2011, 01:25 AM

Oh trust me, 89 octane does pay off... for me at least in my 05.

The cars in those years tend to run more timing than they can ever achieve, thus a quick fix outside of reflashing the ECU which 01s cannot is 89 octane. The increase in gas mileage overcomes the increase in price in most cases. I've been measuring for about a year now. On 89 octane, I can get around 30-32 mpg during long road trips. Quite nice. I measure for miles traveled on odo vs amount of gas filled to the top.

Bluefoton · 01-20-2011, 07:25 AM

^ Very nice.... if I ever hit 30, I'm usualy doing an annual tribal rain dance, and that's with an anally maintained car. Now I'm hoping the increased mileage from new HGs will pay the repairs..evenually

01-17-2011, 10:25 PM	#1
averagebob * Banned * Member#: 267352 Join Date: Dec 2010 Chapter/Region: NESIC Location: account deleted Vehicle: dlt account plz	Gas mileage mods (yes I used search) 01 legacy So what type of things can be done to increase gas mileage from the low 20's on a subaru legacy or any subaru I have heard light weight flywheel (I do a lot of stop and go so this would help?) and light weight rims.... Any others? Engine mods included, links would be great to products. I have searched for subaru parts but come up with generic sites that are trash and only sell universal crap. So right now I get about 25mpg when my Air sensor doesn't puke and throw a code (its in the shop now for head gasket and timing belt next week it gets a new sensor) and I would like to add to that MPG significantly. My thoughts are Light weight pulley set including flywheel Light weight rims (alloy?) Better intake ???? Better exhaust????? I know tune up obviously but I'm looking for a little more in-depth.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New 08 2.5i - Advice on Better Gas Mileage Mods	ericpratum	Newbies & FAQs	27	05-28-2009 11:09 PM
intake mod and gas mileage?	digidelia	Factory 2.0L Turbo Powertrain	2	09-28-2002 01:20 AM
What mods will help gas mileage??	mike270	General Community	35	01-29-2002 07:01 PM
Simple ???: What Mod Would Increase Gas Mileage?	ejicon	Legacy Forum	19	03-17-2001 12:45 AM

01-17-2011, 10:29 PM	#2
Ohhey1 Scooby Newbie Member#: 260297 Join Date: Oct 2010 Chapter/Region: NWIC Location: Portland, OR Vehicle: 2006 STI White HTA Green Methanol	The only thing on your list that will make a difference is lighter wheels and that will probably be so slight you won't notice it. In my opinion, too much money anyway. Buy a slower or lighter car. 25 mpg is good.

01-18-2011, 08:22 AM	#5
renyo Scooby Newbie Member#: 93577 Join Date: Aug 2005 Chapter/Region: MAIC Location: Orlando, unfortunately Vehicle: 98 Impreza	I know my Impreza fuel cuts at around 112 (on the speedo at least).

01-18-2011, 12:24 PM	#7
abgusaf Scooby Specialist Member#: 143122 Join Date: Mar 2007 Chapter/Region: International Location: Across the pond Vehicle: 07 WRB STi in the werks	I would just save the money on everything but a tune, I had an aggressive tune on my wrx putting down between 310 - 320hp at the wheels, and i averaged about 21mpg. Thats both highway and city getting on it pretty regularly. I bet you could get in the high 20's maybe 30mpg with a good tune

01-18-2011, 12:37 PM	#8
JoshP Scooby Specialist Member#: 94350 Join Date: Aug 2005 Chapter/Region: NESIC Location: S. Maine	All those things you listed will help with fuel mileage, so long as you dont change your driving style. 89 octane fuel will also.

01-18-2011, 02:35 PM	#9
GEE-OTTO Scooby Specialist Member#: 201277 Join Date: Jan 2009 Chapter/Region: MAIC Location: Arlington VA Vehicle: 2008 Legacy OBP	89 really? Why ? A Light weight Fly wheel wont help you in low speed situations. Lighter wheels maybe. Engine mods for a Ej251 that will help: better air filter, keep ignition/fueling system fresh.

01-19-2011, 11:31 PM	#11
Bluefoton Scooby Specialist Member#: 141373 Join Date: Feb 2007 Chapter/Region: E. Canada Location: Quebec, QC Vehicle: 2008 2.5i-hatch - now with a HID retrofit	Maintenance, and a brick under the gas pedal. The rest will hardly ever pay off. Flywheel might help a little bit, take low-rolling resistance tires when you change them, overinflate them by a few Psi, drop some weight...

01-20-2011, 01:25 AM	#12
formula91 Scooby Specialist Member#: 102984 Join Date: Dec 2005 Chapter/Region: MWSOC Location: Northbrook, IL Vehicle: 2005 2.5RS 4EAT Platinum Silver	Oh trust me, 89 octane does pay off... for me at least in my 05. The cars in those years tend to run more timing than they can ever achieve, thus a quick fix outside of reflashing the ECU which 01s cannot is 89 octane. The increase in gas mileage overcomes the increase in price in most cases. I've been measuring for about a year now. On 89 octane, I can get around 30-32 mpg during long road trips. Quite nice. I measure for miles traveled on odo vs amount of gas filled to the top.

01-20-2011, 07:25 AM	#13
Bluefoton Scooby Specialist Member#: 141373 Join Date: Feb 2007 Chapter/Region: E. Canada Location: Quebec, QC Vehicle: 2008 2.5i-hatch - now with a HID retrofit	^ Very nice.... if I ever hit 30, I'm usualy doing an annual tribal rain dance, and that's with an anally maintained car. Now I'm hoping the increased mileage from new HGs will pay the repairs..evenually