Reminds me of the stories of people renting the Hertz Shelby Mustangs and welding in roll cages and racing them and taking them back Monday morning.
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I read a story recently, don’t know how true it is but this guy needed new tires for his car, so he rented a car with same size tires, then he switched them, took the rental back the next day.
New set of tires for $39.95.
Most rental companies are smart enough to check the tires when you take them back.