I have been having a conversation with other driving instructors on a UK forum and one made the following comment which I found interesting....
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As a trained mechanic i am also aware of how the geometry of a car is set up to induce understeer when approaching the limits of grip...this causes tyre scrub which is very wastefull with learners doing mano's all the time....so a session with the calculator and tape measure revealed the fiesta required 5mm wheel spacers on the rear wheels to reduce this...makes a huge difference to how far it will keep rolling on full lock.
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Could this really have any benefit in reducing tyre wear and FC?? I find it hard to see, personally. If my car runs freely with the steering in the straight-ahead position, surely the amount of time I will be free-wheeling with the steering turned by any amount will be quite small???
In the case of a learner doing a reverse manoeuver - we are usually doing only 2mph!