You could have not possibly have got that out of what he wrote. Plainly he was speaking of factory stock from the dealership. Nowhere did he say with all that added it would go 15's. Plainly his point was a 383HP 4 speed from the factory running high 14's to low 15's was an underachievement. Hmmm.. that's some mighty twisting of words my friend. :)
Sorry, for the misconception to both of you then. I'm not interested in old magazine times or speeds 50+ years a go on glass belted tires. A lot has changed since then. I took it as unbelief that the Road Runner ran what it did.