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On a 1/4 mi track with much laid down rubber possible but not on the street, maybe 3.1, 3.2. >>
From the article:
"After a 10-sec quarter-mile run (street tires wildly spinning the entire way; rearend skating left and right toward the guardrails), you'll probably need to change your underwear."
The key word there is street tires. No drag radials mentioned...

(aren't I the nitpicker today... must be the 30 hours and counting with no sleep)