It is a big difference. If you take out the bottom AWD car and the top RWD, all the AWDs would be faster than all the RWDs.
I think Sebring Short is the problem as who would have predicted that only RWD (street tyres) missiles could beat the top 4 grip AWD cars. My SebringS times below.
Chevrolet Stingray 69.452
Ford Boss Mustang 429 70.118
Volkswagon Corrado Speed 70.958
Ford Mustang 05 - speed 71.49
Nissan Fairlady Z S 94 71.683
Nissan R34 Mspeed 71.976
Mitsibushi EVO X 71.976
Audi TT 07 S Line 72.011
Toyota Supra RZ 98 72.049
Volvo S60R 72.085
Subaru S204 72.101
TVR Tuscan S grip 72.114
Lancia Delta Evo 72.145
Audi S4 72.24
Seat Leon Cupra 03 72.273
Volvo S60R 2 72.29
Mitsibushi Eclips GSX 72.31
Porsche Cayman 72.4
Nissan R32 72.401
BMW E46 A72.467
Subaru 22B 72.5
Volkswagon Corrado Grip 72.524
BMW M3 GTR 72.54
Aston Martin DB9 72.554
Mercedes C32 72.579
Mazda INGS RX7 72.669
Mercedes C32 72.671
Nissan S14 RWD 72.689
BMW M3 E36 72.72
BMW E46 72.807
Ford Mustang 05 72.83
Acura VIS Integra RWD 72.885
Shelby GT500KR 72.908
Audi RS4 72.96
Nissan Fairlady Z 72.982
BMW M3 E92 73.088
Porsche Cayman 73.12