The answer depends rather significantly on the type of tire fitted on the car. The age of the tire also matters, as tires degrade over time (the tread wears off) which changes the amount of friction between the tires and the ground surface. The degree of inflation of the tire also matters, as does the traveling speed of the vehicle.
But, if you are looking solely for some comparative values, try these coefficients of sliding friction (source below):
Dry asphalt (bitumen): 0.65
Dry concrete: 0.75
Wet grass: 0.2
Noon, R.K. (1994): Engineering Analysis of Vehicular Accidents, CRC Press, Boca Raton.
Additionally, different types of grass have very different frictional characteristics. See the following source:
Cenek, P.D., Jamieson, N.J., McLarin, M.W. (undated): Frictional Characteristics of Roadside Grass Types, Opus International Consultants.
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