Abstract: A thermoplastic polyolefin composition comprising, based on the total mass of the composition, 10-75% by mass of high density polyethylene (HDPE), 8-30% by mass of elastomer, and 5-45% by mass of filler, wherein the composition has a Melt Flow Rate of 1.0-20 g/10 min according to ISO 1133 at 190° C./2.16 kg. The thermoplastic polyolefin composition is produced in a method comprising batch mixing or continuous mixing the HDPE, elastomer, and filler to form a melt blend, and cooling the melt blend to give the product. In addition, the thermoplastic polyolefin composition can be injection molded to form an article, which is preferably an automotive body part. The thermoplastic polyolefin composition exhibits improved heat deflection temperatures, improved ductile failure mode in low temperature atmosphere, improved flexural modulus and lower specific cost compared to polypropylene based thermoplastic polyolefin compositions.