The density ρ(0p s , , or T x ) of 1-butanol and Diesel B0 fuel blends at ambient and saturated pressures and temperatures at T = (253.15 to 468.15) K were measured using an Anton Paar DSA 5000M, DMA 4500, DMA HPM and SVM 3000 vibration tube densimeters of Anton Paar company with an estimated average ρ/ρ = ±0.03 % deviation. The reason of using various densimeters were discussed. The obtained values were fitted to the following polynomial equation. The excess molar volumes E V m /cm3·mol-1 of 1-butanol and Diesel fuel blends were calculated.