Dynolicious-type app for Garmin Nuvi?

Anybody know if there's a downloadable performance meter app for a Garmin? I haven't been able to find one yet...

I thought the dynolicious app used the iPhone accelerometer as well as the GPS reciever? Nuvis don't have accelerometers. You could download your "trip" and run calculations yourself but the time hacks are going to be so crude as to render your calcs not very useful.