I get the impression that the figures they quote arnt actually tested atall, but borrowed from previous tests / magazines / industry figures / made up. I know they quoted my car as 7.7 0-60 with a top speed of 121 MPH, yet i know they never tested it. Those figures probably came from the Williams brochure, or a call to an expert. Also i bet they dont test the 0-60 of the cars at kerb weight, which is what Renault do for official figures. I think that with a full tank of fuel my Williams may be closer to 7.7 that Renault quote. I also think the 7.1 quoted by Renault for the 182 is probably right if we are talking kerb weight. My figures at kerb weight for the following cars would be (estimate):
V6 MK2 - 5.8 to 5.9
Cup - 6.9 to 7
182 - 7 to 7.1
172 - 7.1 to 7.4 (depending on MK1 or Mk2)
Williams - 7.5 to 7.7