You are stuck with the truck that you bought based upon the facts that have written about concerning the purchase of the car that you received in that the core issue is whether or not the truck that you purchased was worth what it was in terms of dollars and cents.The EPA rating is simply a rating based upon miles per gallon city and freeway where different vehicles with different drivers will have different results. Although what the salesperson stated may have been wrong as to the EPA, the key is whether or not there was anything physically wrong with the vehicle that you purchased affecting price paid or its desirability to a willing buyer.The three day right to cancel a contract law applies to home solicitation contracts which your matter was not such.