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You need to know how much distance was covered to even approach an interpolation.
Buy a Performance Box from Racelogic, and you can time pretty much any distance you want.
vboxusa.com
Pricey at $500, but it is GPS-based, and works like a charm for closed-course testing.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.