2-Butanone (C4H8O) is a promising alternative fuel candidate as a pure as well as a blend component for substitution in standard gasoline fuels. It can be produced by the dehydrogenation of 2-butanol. To describe 2-butanone's basic combustion behaviour, it is important to investigate key physical properties such as the laminar burning velocity. The laminar burning velocity serves on the one hand side as a parameter to validate detailed chemical kinetic models. On the other hand, especially for engine simulations, various combustion models have been introduced, which rely on the laminar burning velocity as the physical quantity describing the progress of chemical reactions, diffusion, and heat conduction. Hence, well validated models for the prediction of laminar burning velocities are needed. New experimental laminar burning velocity data, acquired in a high pressure spherical combustion vessel, are presented for 1 atm and 5 bar at temperatures of 373 K and 423 K. An already existing mechanism, thoroughly validated with shock tube and rapid compression machine data, is compared against the new experimental data. It was found that the mechanism needs improvement with respect to correctly predicting temperature and pressure sensitivity. In addition, a linear and a non-linear post-processing technique are used to estimate the laminar flame speed in the burnt. Depending on the experimental conditions, such as temperature, pressure, and equivalence ratio, the extrapolation methods significantly differ in results. Thus, it has to be carefully assessed which extrapolation technique is the correct choice.