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Firstly cars are a good safe place during a thunderstorm because the metal bodywork acts as a Faraday cage. Also tyres contain a fairly high proportion of carbon hence they are fairly good conductors of electricity.
I remember before the UK troops took their vehicles to the Falklands a so-called expert recommended that all the vehicles (especially those with electronics onboard) be fitted with flexi rubber earth straps - I'm sure you seen them for sale in some car accessory shops - they bolt to the car and trail along the ground. Subsequent tests went on to prove conclusively that the rubber tyres of the vehicles where actually much better than the so-called earthing straps at dumping static. If I find a reference to it I'll post it up.
Futhermore if tyres did not discharge static - fuel delivery tankers would need to connect to an earthing point whilst delivering petrol to every filling station in the world.
Currently in madnoel10's garage:
Honda Civic 1.4l