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Subaru Impreza Engine Problems

241 messages,  Last post on Nov 26, 2009 at 5:37 PM

You are in the Subaru Impreza Maintenance & Repair Forum. Your Host is kcram

What is this discussion about? Subaru Impreza, Engine, Sedan, Wagon


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#31 of 241
Re: I want my MPG.... [camp26] by terry92270
Dec 05, 2006 (8:14 pm)
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Replying to: camp26 (Dec 05, 2006 6:53 pm)

What year?
#32 of 241
Re: I want my MPG.... [camp26] by subearu
Dec 05, 2006 (8:20 pm)
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Replying to: camp26 (Dec 05, 2006 6:53 pm)

Just recently? Could be reformulated gas or winter blend, both which can affect MPG. Where are you located?
 
-Brian
#33 of 241
Re: I want my MPG.... [camp26] by once_for_all
Dec 05, 2006 (10:24 pm)
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Replying to: camp26 (Dec 05, 2006 6:53 pm)

the number one culprit is tire pressure. Especially in cold weather. I like to run mine at 33 psi, and generally get 28 mpg.
 
The reformulated gasoline will also give you a hit this time of the year. As will running the defrost full time (AC).
 
John
#34 of 241
MPG by paisan
Dec 06, 2006 (7:20 am)
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Did your area recently switch to the 10% or more % ethanol? This will drop down your MPG, also cold starts will reduce the MPG because you are running in closed loop for a longer period of time.
 
-mike
#35 of 241
Re: MPG [paisan] by ateixeira
Dec 06, 2006 (10:59 am)
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Replying to: paisan (Dec 06, 2006 7:20 am)

We're definitely using E10 here in MD now. 10% ethanol.
 
-juice
#36 of 241
Re: MPG [paisan] by terry92270
Dec 06, 2006 (11:01 am)
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Replying to: paisan (Dec 06, 2006 7:20 am)

10% Ethanol shouldn't effect MPG by anything so noticeable. They do it seasonably in California.....
#37 of 241
Re: MPG [terry92270] by paisan
Dec 06, 2006 (11:04 am)
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Replying to: terry92270 (Dec 06, 2006 11:01 am)

I beg to differ. When we switched to 10% here in NY/NNJ a few years ago, everyone I know dropped at least 1-2mpg across the board on their cars. If you combine this with longer warm-up periods in the winter, and reduced air pressure in the tires, you can see a substantial drop in mpg.
 
-mike
#38 of 241
Re: MPG [paisan] by terry92270
Dec 06, 2006 (11:07 am)
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Replying to: paisan (Dec 06, 2006 11:04 am)

Mike,
 
Yeah, sure...I have the same problem Winters in Reno. Its the warm-up. Unless you also believe running the AC significantly impacts mileage too. I don't consider 1 MPG "significant".
#39 of 241
Re: MPG [terry92270] by paisan
Dec 06, 2006 (11:12 am)
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Replying to: terry92270 (Dec 06, 2006 11:07 am)

It's all cumulative. Longer time to get the engine to operating temp, tire pressure lower due to lower temps (most folks don't check em), A/C running more due to defroster, etc. Put it all together and it can add up to 5mpg.
 
1-2MPG is significant when you only get 13-14mpg in city driving.
 
-mike
#40 of 241
Re: MPG [paisan] by terry92270
Dec 06, 2006 (11:32 am)
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Replying to: paisan (Dec 06, 2006 11:12 am)

"Signifigant" is when and if my 550S gets 5 MPG more.
 
But at the price paid for it, and what it is, you won't see me crying over it, or concerned, as that would indeed be ridiculous.

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