[aerohead]

Out of respect for j-c-c's instincts, I located the original article from CAR and DRIVER, August, 1992, pages 95-96:
'How Tough Are the Compact Spares', by Don Schroeder.
Thirty-one years later, my brain managed to pretty-much destroy the original contents.
* A Corvette, and a Ford Taurus LX were the test cars.
* Only 'ONE' tire was replaced by the donut.
* Cars were tested OEM, with a donut on the front, and then on the rear.
* They were tested for:
1) acceleration to 60-mph
2) braking from 70-mph
3) emergency double lane change
4) roadholding on the 300-ft skidpad.
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For the Corvette:
* The compact spare had 56% the width of the OEM tire it replaced.
* 0-60 took 1/10th second longer, 5.2-secs vs 5.1-secs with donut on rear ( front was not tested ), it's a RWD car.
* 70-to-0 was 174-ft, compared to 165-ft with donut on front
* 70-to-0 was 174-ft vs 165, on the rear.
* lane change was 62.2-mph vs 62.9-mph at front.
* 59.6-mph vs 62.9-mph at rear
* On the skidpad, 0.84G vs 0.92g at front
* 0.90g vs 0.92g at rear
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For the Taurus:
* No width comparison data was provided
* 0-60 was 9.7-secs vs 9.8-secs at front ( a FWD car )
* 70-to-0 = 214-ft vs 200-ft @ front
* 215-ft vs 200-ft @ rear
* lane change was 53.6-mph vs 57.5-mph at front
* 57.2-mph vs 57.5-mph at rear
* 0.73G vs 0.76g at front
* 0.76g vs 0.76g at rear