November issue of car & driver mag. did a test on a new 260HP Mustang GT. The test went like this.....87 octane gas vrs. 92 or high octane gas. Their test showed an absolute increase in HP by 2 with the 92, however, the 1/4 mile runs were better with the high test by a whopping .3 of a second. That tells me high octane gas is the difference between 14.20 and 13.90 in the runs. I don't know about you, but for a couple bucks a tank, I'll take the high test!!