Bikes & Cars...

The latest online app to help drivers track fuel economy comes from Moblu. The site asks for your vehicle’s year, make and model then requires you to create a user name and password.

Where, you might be asking, does the social networking come in? Moblu uses your Twitter user name (no Twitter password required) to share your mileage with other Tweeple. Moblu users can record events that might affect gas mileage,...