This paper analyzes data from 48 crash tests involving four types of frontal barrier impact and five car models. Vehicle crush coefficients are derived, and a method is described to optimize these coefficients over a range of tests. Crush coefficients are calculated for full frontal barrier impacts, 30 angled barrier impacts, central pole impacts, and off-center pole impacts for each of the five car models. Then, by assuming a fixed threshold of damage for each type of impact, a method is described to derive directly the vehicle stiffness coefficients. Using this technique, the variation in vehicle stiffness as a function of vehicle test speed for full frontal barrier impacts is explored. Finally, the variations in the crush coefficients are discussed in relation to the CRASH3 accident reconstruction program to assess the effect on estimating velocity change.