I think that racing industrys should be forced to use biofuels because of several reason,first of all ,racing industrys are meant for only entertainment and we know that whats the level of petrol and diesel in the world.And one thing is also that ,biofuels are mainly derived from waste product and they are less poisonous to the enviornment.so ,it is very good not only for racing industrys but for all purpose.