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Discussion Starter · #1 ·
Would it be preferable to use mid grade or premium when towing?
Is this is a high compression engine? Worried about it retarding the timing if it encounters detonation...need all the power I can get.
 

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Compression ratio on the engine is 10.6:1, same as the WRX. The STI engine is 8.1:1.

All three have tumble generator valves and Dual Active Valve Control Systems with Variable Intake Valve Timing. (The WRX and STI also have that for their exhaust valves as well.)

For comparison, the Outback engines are 10.3:1 and 10.5:1, while the new Forester engine is 12.0:1. (And the BRZ is 12.5:1.)
 

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It was designed to run on 87. It will run on 87 under any conditions.
 

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Discussion Starter · #5 ·
Understood. My high compression V6 Toyota also runs on 87, but 93 can be run to improve performance. Although it takes a couple tanks for engine to remap.
The question is will this engine run better under heavy load on higher octane? Would it provide more power because detonation is not a factor and the engine is not retarding the timing.
 
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