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I am not reading 43 pages of replies but if it didn't get mentioned yet the car will alter the timing so it dosent knock on lower octane gas.
You will get slightly poorer fuel economy on 87.
There are tons of threads on this for the last few years.
I got 24mpg doing 79 across kansas on 87 octane and then I got 27mpg with 93 octane. It was pretty much noticeable after the first 30 mins when I reset the trip meter.
If you do all the math the extra 3 mpg more you get only adds up to be about 42 more miles plus per tank depending how far you drain the tank. It just makes more sense to put in the cheap stuff.
The only way I would do premium is if I wanted max range and the extra 42 miles would get me all the way home without stopping.
I find my bladder needs more attention than the car needing more range.
Hope that helps.
Oh by the way. The best way to increase MPG is slow down on the highway. I can get over 30mpg at 60mph. But who drives 60 mph?
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