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I use regular. I tried one tank with premium, and got relatively lousy mpg (29!). Despite the relatively high compression (~10.5:1, similar to the Matrix/Vibe), it seems to run best on cheap gas. E10 may or may not be an issue with the 1NZ-FE, as well. I'm sort of currently studying that.
Interestingly, I get my best tanks with Indian reservation gas, as it generally doesn't have ethanol, and racists insist that it's "watered down." Plus, it's generally $.30/gal cheaper than everywhere else.
...never mind that you can't water down gasoline. High school physics/chemistry is apparently beyond the grasp of the average person.
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