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12-16-2001, 09:03 PM | #1 |
Scooby Newbie
Member#: 13056
Join Date: Dec 2001
Location: Maryland
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Recomended Gas for 99 RS 2.5
What type of gas does a impreza 2.5 RS take, i dont have an impreza yet but i think an average of 22mpg is terrible... so i was wondering if it took the highest octain gas or average
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12-16-2001, 10:08 PM | #2 |
Miss You Mom
Oct 1940 - Feb 2008 Super Moderator Member#: 809
Join Date: Jan 2000
Chapter/Region:
NESIC
Location: NH, Land Of Many Trees
Vehicle:2000 2.5 RS, '14 For 92 5MT SVX |
It's recommended that you put in 89 by Subrau IIRC. Higher octane gas does not necessarily equal better gas mileage however .
Brian http://www.northursalia.com http://www.imprezamods.com http://www.scoobymods.com |
12-17-2001, 10:24 AM | #3 |
Scooby Specialist
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I always run 93 octane. Your gas mileage just depends how you drive and where you drive. I only drive like 5 miles a day to work and get terrible mileage (around 22mpg). Last fall i went for a road trip down through NC on the blue ridge parkway,( 45 mph for 250 miles, and got close to 33 mpg IIRC.)
Dave |
12-17-2001, 10:28 AM | #4 |
Scooby Specialist
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Location: Ventura, CA
Vehicle:MY00 RS BRP |
Subaru recommends 87 octane.
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12-17-2001, 12:26 PM | #5 |
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Location: Ottawa, Ontario, Canada
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keep in mind, no subaru is a gas miser....... or any AWD car isn't a leader in this category.....
When I go on road trips, I always get over 30mpg.... around my home, I get 26-27mpg..... Robin |
12-17-2001, 12:44 PM | #6 |
Scooby Guru
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Vehicle:'01 GC8 Dinged STM '09 Concours 14 ABS Black |
running race gas will do absolutely NOTHING for an impreza except superheat the cat. it doesn't matter what you do unless you drive VERY conservatively you are going to get between 18-22 MPG city driving....i get 30-33 on the highway. Well anyhow don't put race gas in it.
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12-17-2001, 01:29 PM | #7 |
Scooby Newbie
Member#: 5456
Join Date: Apr 2001
Location: Lisle, IL.
Vehicle:2001 RS Aspen White |
I would be cautious of Race fuel. In HS my friend had a 1980 cutlas 6cyl, and he decided to fill up and add a whole bottle of ocatine addative (108 ocaatin I beleive for 22 gallons worth) to a 16 gallon tank. THe car went like hell at first you tap the gas it was like a rocket. hour later knock knock next day bam!!! no more engine. Be careful if you go for the super high stuff.
Chris |
12-17-2001, 02:26 PM | #8 |
Scooby Newbie
Member#: 9677
Join Date: Aug 2001
Location: Peoria, IL
Vehicle:2002 2.5 RS Aspen White |
I use 87 and get 19mpg around town and got 25mpg on my last road trip. Not very good.
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12-17-2001, 03:42 PM | #9 |
Scooby Guru
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sorry thought i read race gas in there somewhere, wow was i tired this morning...just run 87or 89...i run 89 when i know i'll be beating on the car. Just keeps her from pinging and or knocking.
Jeremy |
12-17-2001, 05:16 PM | #10 |
Scooby Guru
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for my 00 with 10 to 1 compression ratio
87 in the winter or 0-80F 89 in the summer or 80-110F (87 pings in bog when its hot) as for a my 99 with 9.7 to 1 i would guess that it would be very simmilar 93 is a waste of $$ |
12-18-2001, 04:53 AM | #11 |
Scooby Specialist
Member#: 6467
Join Date: May 2001
Location: philadelphia, pa, usa
Vehicle:1999 Impreza 2.5 RS silver |
i run sunoco 87 all the time and i get about 18 to 20 MPH in the city but as of late im getting horrible milage im at a little under a 1/4 tank and i have only gone 190 miles on the other 3/4!!!!!
Nate |
12-18-2001, 10:53 AM | #12 |
Scooby Guru
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nate two things ... winter gas...and
is your gas gage screwed up? |
12-18-2001, 11:10 AM | #13 |
Scooby Specialist
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Join Date: Mar 2000
Location: Ventura, CA
Vehicle:MY00 RS BRP |
Heck, the Sube is rated by EPA at 21 city. Unless you put around like grandma you should be happy to see that figure. I know I don't get that in the city, and I don't rip every gear.
After various mileage posts, the average MPG for the RS is what the sticker says, give or take a gallon or two here or there. Commute I get 26-27, when I drive I get 23. It's not an economy car. |
12-18-2001, 11:42 AM | #14 |
GC84Ever
Super Moderator Member#: 301
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Vehicle:1970 FF-1 & '70 Van 02 WRX/01 RS |
* check your manual
* choose a gas and stick with it i have run 89 since day one in my car and i get pretty decent gas mileage! everyone has their own system tho. good luck jamie www.subiegal.com |
12-18-2001, 07:56 PM | #15 | |
Scooby Newbie
Member#: 9677
Join Date: Aug 2001
Location: Peoria, IL
Vehicle:2002 2.5 RS Aspen White |
Quote:
Anyway the manual says 87 or higher. Hopefully that will answer the question. So you can use 87, should be no problems. |
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12-18-2001, 08:51 PM | #16 |
Scooby Specialist
Member#: 6935
Join Date: May 2001
Vehicle:1999 Impreza 2.5RS Rally Blue |
I ALWAYS run 92, since my car has been mysteriously pulling timing between 3400 and 4000 rpm since almost new (now with over 40k). I figure the extra few $s per tank might help.
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12-18-2001, 10:27 PM | #17 |
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as far as the 2.5 NA block is concerned, it must be bliss to know that some of you are wasting your money on anything higher than 89 octane.
Unless you are running higher than 10:1 compression, you're chipped, or have a FI (or a combination of any of that), there is no need to run a higher octance.. Mileage is the same, Performance is the same, It even burns the same. Save your money and use what the base stuff. |
12-18-2001, 11:14 PM | #18 |
Scooby Specialist
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Join Date: Apr 2001
Location: Ottawa, Canada
Vehicle:2000 GC8 STi V4 swap BRP |
I did a lot of sampling on the fuel and fuel mileage 1.5 years ago when I was hacking the stock ECU. Here is what I found.
87 octane in colder weather gives you the best fuel mileage. 89 octane in warmer weather gives you the best fuel mileage. 94 octane plus some 110 octane race gas does give you significant gains, especially if you reset the ECU. These gains are largest in the 5000rpm to redline range. -Michael |
12-19-2001, 01:09 AM | #19 | |
Scooby Specialist
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Vehicle:00 GM67 BRP me ASAP |
Quote:
please explain how you determined mileage for a specific rpm range. alternatively, explain what you really meant |
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12-19-2001, 03:45 AM | #20 |
Scooby Specialist
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SCIC
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Vehicle:2001 Impreza GM6 Rest In Peace. 2/01-10/04 |
Shell, 89 octane baby!
-Jason SDC |
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