I've been using automobil 1.6 for Palm for a while now. They have updated it many times over and mine is totally out of date, however it is easy to use, has full history and does exactly what I want it to do.

It has been said:
Hybrid drivers come in 3 flavors, greenie, techie and cheapie. Pick any 2.
2005 Prius, Melinium Silver over gray, package 5 (AI)