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Administrator, Resident Tater Salad
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The 1.8 has a compression ratio of 10.5:1. Saw the spec sheet for myself when my brother bought his 2012 ls. Fortunately I was there to ask that question as the salesman pointed at the 138 hp spec on the info board. He ended up taking me to a back office computer and brought up the full spec sheet for me to see.
On par with most modern non-DI N/A engines.

I could see it helping with a heat soaked engine or low RPM power. Our Toyota has the same CR and runs slightly better on 89 than 87 on a hot summer day with the A/C cranked. 93 makes zero difference in that.
 

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Administrator, Resident Tater Salad
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17,598 Posts
My MX-5 by comparison is running 13.0:1
DI engines can run much higher CR's on 87 because fuel isn't injected into the cylinder until it hits TDC. Better spray pattern, too. Don't need to worry about compressing the fuel and pre-igniting it.
 
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