G-Force uses the 3-axis accelerometer to analyze vehicle performance. Measuring performance with the accelerometer is more accurate and reliable than using GPS.

G-Force uses real-time 3-D rotations and auto-senses the direction of gravity so performance can be measured with the device in any orientation.

This is the full version, which computes velocity and position in straight line acceleration to provide 60', 0-60 and 1/4 mile times, speeds and distances and power output. It captures results and saves them as text files on the local device. It also has extras like adjustable font size.

If you want to test this application on your device, the free version is here:
http://play.google.com/store/apps/details?id=com.mrc.gforcefree

Details:
http://mclements.net/clementslogic/gForce.html