I've been conducting a long term study on my supercharged F150, which uses an aggressive custom tune with lots of timing, to compare the efficacy of various over the counter octane boosters. I have dual tunes on my truck for street and strip, with vastly different timing profiles. The street tune is designed for 93 octane, but is still too aggressive to run full timing on pump gas. I took advantage of this fact to test various octane boosters, including Royal Purple Max Boost, Lucas Octane Booster, and STP octane booster.
To test I used my data logging device to record before and after acceleration pulls logging spark advance, knock, and other variables on the same night with the same tank of gas; the only difference being the presence of the octane booster. To make a long story short, the three I've tested so far worked as advertised.
The test is still ongoing, but because I need several flushing tanks between tests and the low mileage I accrue, it is taking awhile. I'll be conducting a different set of tests on the professional level products with my racing tune, but that is some time off.
For anyone curious,
go here to read my results. I'd repost the thread on this forum, but it'd be a lot of work with all the pictures.