Acurate analysis has a double deck diffuser worth about 0.5-0.6 seconds per lap on the Brawn (because of the way they scoop air in under the nose) and 0.4-0.5 for Williams and Toyota.
You might see brawn pull out a bit more of a gap now because they don't have to pretend the diffuser is only a small advantage. I can tell you now none of the Non-diffuser cars were sandbagging to try and make the Brawn look faster than it really is.
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