Awesome, squid!

A great analysis that puts fuel-related discussions in perspective.

So, since higher octane fuel gives a little better power, I deduce that one should also expect a slight mileage improvement (as long as your right foot isn't too "squirt-happy").

Where I live however (Ontario, Canada), 91 octane gas is about 9 to 10% more expensive. This leads me to conclude that unless the mileage improvement is in that same range (or better), it would still be more economical to run with regular 87 gas, no? (BTW, I'm assuming here that the engine computer will adjust sufficiently so there's no detonation and fuel still burns as "cleanly".)

I'm just wondering because I'm experimenting with my first tank of regular and although I notice a little less power, I'm finding the engine less "surgey" (if that's a word!) and less prone to kicking down too far when accelerating from a highway on-ramp, for example.