I love webOS. However, the fact is that, right now, one can do more with Android than with webOS. I run CM9 on my Touchpad and the quirks of my Pre 2 are irritating. I'm switching to a Galaxy Nexus and need to convert data for some apps.
byebye-webOS is a collection of scripts to convert data from webOS application to Android alternatives. Feel free to reuse these script if you're switching phone/tablet to Android. Be aware that you will, most certainly, have to modify them to suit your needs. Fork away!
This script enables you to convert data from Mileage Monitor webOS app to Fuel Log Pro (you'll need the Pro key to be able to import your data).