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Daryl
Although it will not make much of a difference, you shpould note that if you reduce the tyre width, you also reduce the tyre height (assuming the profile remains the same).
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All in all unless the savings is substantial - I'm not sure I would go that route. As far as cruise control - it will not be affected. However, your speedometer will read a little faster than it does now.
Keep in mind that unless your spare is the same size you might have issues if you have to run on your spare.



