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Old 08-11-2013, 12:49 PM   #29 (permalink)
EcoModding Lurker
Join Date: Apr 2013
Location: Nj
Posts: 48

wrx - '02 subaru impreza wrx wagon
90 day: 33.81 mpg (US)

Leg - '05 Subaru Legacy 2.5i
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Originally Posted by AbeisAverage View Post
Okay finally found something, apparently in the manual it says it can run on 87 temporarily for emergencies, however it's for a 2010 wrx. I can't tell if the warning beforehand says it doesn't apply to the sti. That's what it looks like, though. Does it cost a lot of money to add knock sensing capabilities to the computer? Is it like entirely a thrown out idea because it's the sti version?
They both have knock sensors and the ecu accounts for it, the difference is that adjusting for more knock will damage valves, pistons, and in prolonged use worse. Any car that requires 91+ octane can use 87 for "emergencies", it not suggested to run a full tank. There are easier ways of gain mpg's or testing mpg performance in these type of cars. If you're looking at paying less at the pump a performance car isn't for you or save up and buy a tesla then never use the performance because using the 0-60 gets you a lot less miles.
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