Well color me surprised, it doesn't have a ridiculously high compression ratio, wonder why they want premium?
10.5:1 is not really a high compression ratio. Once you're over 11.5:1 then maybe I can see recommending 91+ octane. My MX-5 by comparison is running 13.0:1 and an older ford triton 5.4L will be running 8.4:1 so 10.5:1 is kind of in the middle of the spectrum. Almost all of your non-turbo average family sedans and crossovers will be running similar compression and those won't recommend premium.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.