A wide variety of oxygenated additives from renewable origin may be used in next-generation biofuels. In order to contribute to the international effort aimed at developing and using environmentally sustainable fuels, the present study focuses on the thermophysical characterization of new blends of hydrocarbons and 1-butanol (known as a second generation biofuel) through viscosity measurements. A vibrating-wire viscometer was developed to accurately measure dynamic viscosities at T = (293.15-373.15) K and p = (0.1-140) MPa. The relative expanded uncertainty of the dynamic viscosity was estimated at 1.5% for a coverage factor k = 2. As an initial characterization of biofuels, the dynamic viscosities of (1-butanol + 2,2,4-trimethylpentane) and (1-butanol + 1,2,4-trimethylbenzene) mixtures, as well as 1-butanol, are reported at different temperature and pressure conditions. (C) 2016 Elsevier Ltd.