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Old 08-09-2013, 09:30 PM   #19 (permalink)
Awd180
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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Quote:
Originally Posted by AbeisAverage View Post
I totally forgot the intelligent mode was essentially an eco driving mode. I was also going to ask if you're putting premium in and if you're willing to see difference octane ratings have with the car?
The problem with using lower octanes is engine knock, a retune or engine map could account for it but it's not recommended with forced induction. The higher the octane the more it resists detonation. Basically without tuning for the lower octane mpgs would be worse, or cause more damage in the long run even with a tune/map. It is debatable, but dozen have burnt out cylinders from lower octane or the wrong a/f ratio in these and other high performance engines.
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