Data acquisition boxes are installed in Chrysler cars and trucks to measure their usage. The data is transmitted wirelessly and stored for future analysis. The resulting individual vehicle files are large, with about 20 million time-stamped records for 40 to 50 data channels collected at a rate of one and five readings per second for about a year. Traditionally, engineers have used tools like Microsoft^® Excel^® to analyze this data, but Excel is limited to 1,048,576 rows of data. This presentation discusses how Chrysler uses MATLAB to read and analyze the data and project customer usage.