there was a lady recently, driving a duramax, that i towed to a Walmart parking lot cause her truck died in an intersection. i later found out through a good friend that she took her truck to the local chevy dealership and they discovered gasoline in her tank and fuel system. they asked her about it and she said admitted, yes, she did infact fill up with regular unleaded because she didnt want to pay the higher price for diesel. she needs a new motor now from what i understand. customer pay, no warranty because she neglected to fill up with diesel.