Ah yes, definitely the difference is much more noticeable when it's hot- and it's been awfully hot this past month! In general 'the Bird' doesn't like the extreme heat all that much (or maybe it's just me that doesn like it...).

I note the odometer and keep all my gas receipts, but haven't sat down and tabulated it all in a while, so I don't know what kind of mileage difference I'm getting with low vs. high octane.

Thanks all for the feedback.