[gavinp98]

I have a modified 2008 subaru wrx sedan currently getting a new block right now. i am going to be driving it 1000+ miles in a month and was wondering what are some ways i can get better MPG. i currently get 15 city 18 highway.... not to great for a 4 cylinder. obviously the tune is the main reason why its sucking my gas tank but just to save a couple mpg would be a huge help if anyone could give some advice.

 

[mattiekane]

A bloody good service can some times help a little

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[irickchad]

Your bad gas mileage could've been related to whatever made it blow.

with a good tune and proper maintenance (Clean maf/filters, good plugs, etc) you should be getting at least 21-23 hwy and 17-19 city

 

[goodysgotacuda]

Driver influence plays a huge role. I had tanks in my TDI swing from 48mpg to 37-38mpg depending on how I drove along the same commute. ~20%

Do you have any aero mods? Wing, splitter, spats, etc? If so, lose them, they are all increasing drag.


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[tbagftw]

Gavin,

Glad you are able to get a new engine block and back on the road so quickly. I found I get around 18 to 26 in the city(San Francisco) depending on how much traffic and hills I have. Light traffic and good cruising distance will result in 26mpg but otherwise will get around 18.

If you like to accelerate quickly, then you are getting the right mpg.

I am not sure if you had any experience in driving a Honda Civic Hybrid. But if you did, then you will know how to be very light on the gas paddle. I mean the gas I give is just enough to move the car without stalling it, and shift below 2k RPM and shift aggressively so I can cruise without much gas at all. It's definitely not a "fun" drive but it helps a lot with mpg.

 

[JaySin]

I had an '08 WRX with a pro tune and intake, otherwise stock. On a highway trip from Michigan to Alabama I avg'd 29MPG. In the city I typically got about 22MPG. 15/18? That's just big V8 territory.

 

[jimbobborg]

Use cruise control, keep it under 2500 rpm while on the highway. Minimize acceleration.

 

[tbagftw]

The last weekend I took a road trip and I avg about 36mpg on freeway for a 50mile trip. The same car goes for 18 to 26 in the city... lol

 

[irickchad]

2500RPMs on the highway is like 60mph, lol.

 

[XJman]

I get about 19 on the highway, and 15 city driving. I don't think there is a lot you can do, you'll never see 30+ consistently on that ej

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[tbagftw]

2500RPMs on the highway is like 60mph, lol.

I was doing 65 to 70 mph. The RPG was between 2500 to 3k. Never passed 3k.

 

[tbagftw]

I get about 19 on the highway, and 15 city driving. I don't think there is a lot you can do, you'll never see 30+ consistently on that ej

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Ouch! Do you get stuck in traffic all the time on highway? It should be much better than that.

 

[XJman]

This topic comes up often, and more people get around d 19-22 highway than get anything less. But I wouldn't expect great mileage on a modified engine, ever.

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[MainFrame]

Precise control of your right foot will be the biggest factor by far. I was able to get anywhere from 16mpg to 32mpg averaged over an entire tank of gas, mixed city and highway driving in my modified bugeye depending on how I drove.. and that car doesn't have cruise control.

 

[MainFrame]

obviously the tune is the main reason why its sucking my gas tank

A good tune will increase fuel efficiency over the stock tune, not the other way around.

 

[Blk17WRX]

A good tune will increase fuel efficiency over the stock tune, not the other way around.

Exactly what I was going to say.

 

[gavinp98]

obviously the tune is the main reason why its sucking my gas tank

A good tune will increase fuel efficiency over the stock tune, not the other way around.

A good tune will increase fuel efficiency over the stock tune, not the other way around.

Exactly what I was going to say.

Well it's not exactly a Gas saving tune. It was tuned solely for performance.

 

[gavinp98]

I get about 19 on the highway, and 15 city driving. I don't think there is a lot you can do, you'll never see 30+ consistently on that ej

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I had a f150 before this and didn't think they would get the same mpg.

 

[gavinp98]

2500RPMs on the highway is like 60mph, lol.

I was doing 65 to 70 mph. The RPG was between 2500 to 3k. Never passed 3k.

I put it in cruise control on the highway at 80 mph speed limit is 75 so it sits in 5th gear at 3k rpm. I'd imagine that's why it gets 18mpg?

 

[gavinp98]

Gavin,

Glad you are able to get a new engine block and back on the road so quickly. I found I get around 18 to 26 in the city(San Francisco) depending on how much traffic and hills I have. Light traffic and good cruising distance will result in 26mpg but otherwise will get around 18.

If you like to accelerate quickly, then you are getting the right mpg.

I am not sure if you had any experience in driving a Honda Civic Hybrid. But if you did, then you will know how to be very light on the gas paddle. I mean the gas I give is just enough to move the car without stalling it, and shift below 2k RPM and shift aggressively so I can cruise without much gas at all. It's definitely not a "fun" drive but it helps a lot with mpg.

Car is not done yet but need to prep for the long 1000+ mile drive when it's ready which should be in the next week or so. City driving ya I understand I love to drive the car and give it some gas so 15mpg city isn't something I mind but 18mpg was horriblI drove 100 miles doing 75-80mph the entire time no traffic. It's at the tuner right now should I maybe talk to him about a new tune?