Can't use miles since last fill-up?
 

When I used Fuelly in the past you could track your MPG by using the miles driven since last fill-up. Now it wants to use total miles driven. I don't want to track my MPG that way. Is there not a way to change it back to the old method?

Yea click edit vehicle and swap your method there, towards the top somewhere. Remember to save changes at the bottom if applicable.