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Old 06-25-2005, 08:52 PM   #1
Scooby Newbie
Member#: 72943
Join Date: Oct 2004
Location: WA
2005 WRX Sdn

Default Boost guage indicate gas mileage?

N00b here.. I was wondering if the boost guage can be used to indicate what kind of gas mileage you're getting. On the freeway I notice that when I set the cruise control going about 70 that more boost is used in 5th gear than in 4th. Do I get better mileage in 4th gear?
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Last edited by Dionysos911; 06-25-2005 at 09:00 PM.
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Old 06-25-2005, 09:28 PM   #2
Scooby Specialist
Member#: 83790
Join Date: Mar 2005

Nope my good sir. You will boost lower in 1st gear than 2nd and so on. More boost is used to propel the car faster in higher gears.

For example. I boost 11psi in first, 13.2-13.5 in second, 14 psi in third, 15 psi in fourth and fifth.

I am Cobb Stage 1 by the way.
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Old 06-26-2005, 12:39 AM   #3
Scooby Specialist
Member#: 79394
Join Date: Jan 2005
Location: reston
02 gda


^ yep

just keep it in the highest gear possible without bogging the car and you'll get the best possible gas mileage
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Old 06-26-2005, 01:02 PM   #4
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Member#: 48589
Join Date: Nov 2003
Chapter/Region: SCIC
Location: Murrieta, CA + SAN DIEGO


Since I've installed my boost gauge I've gotten better MPG...I try and keep it at 0 or in vacuum as much as I can. IIRC keeping it in vacuum will net better gas mileage.

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Old 06-26-2005, 02:11 PM   #5
Scooby Specialist
Member#: 65277
Join Date: Jun 2004
Location: Columbus, Ohio
2004 WRX Wagon
Platinum Silver


Keeping it in vacuum means you're not gassing the car as much. I don't think the turbo being active actually reduces gas mileage much, if at all, but having it in positive boost means you're asking the car to do more (i.e., you're getting on the accelerator, and the car is keeping up to your request by going into boost).

Like any car, asking for rapid acceleration means getting worse mileage. The boost guage is a good way to eyeball this because it gives you a direct visual cue as to what you're currently "asking" your car to do.
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