Add driver to car already in garage, for shared car
 

I have a two driver car and often the other driver buys gas for this car. How do I link this car in my garage to their fuelly account ?

If I report my fill ups to my fuelly account, and they report their fill ups on their account, it will look like two cars getting 60 mpg each (or given than one of us fuels up more often, 45 and 80 mpg each) instead of one car getting 30 mpg and driving twice the miles.

Click on the edit vehicle link on the page for the vehicle you want to share. Scroll down all the way to the bottom of the page and click the Share button. Follow the steps from there.