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DearCustomer- A coupon is not a legally binding contract but only a form of advertising. It says "see dealer for details" and I'm quite certain that one of the "details" is that you can only use one coupon per vehicle. If this were no true you could use 20 coupons and get a $20,000 auto for free!
No court that I know of would rule that you could do this.
David Kennett - JD - Attorney at Law