The SpeedM8 programming system is designed to provide accurate speed conversion for every vehicle in the database. Some vehicle manufacturers build an 'over speed' element into their vehicles’ speedometers, while others are very accurate.The vehicle data for each entry in the directory contains a conversion factor appropriate to that model, ensuring that every conversion is accurate.This is a huge advantage over 'fixed calibration' converters, as they will simply result in an inaccurate MPH conversion for vehicles that are supplied originally with an inaccurate speed system.