Bi-fuel vehicles, LPG, CNG

Can I use Fuelio with bi-fuel vehicles (CNG, LPG)? What about fuel types?

Since January 2016 it's possible to track your expenses also for bi-fuel vehicles. Just make sure you have setup fuel type in vehicle section (Menu/Vehicles). You can set up your car there (for example gasoline + LPG/GPL).
After setting vehicle to bi-fuel while adding new fillup you can choose fuel sub type and tank you are filling up.

Flex cars support
If you are driving Flex car and you can fill up your car with gasoline and ethanol but for the same tank - do not check bi-fuel option. Use Flex setting and you'll be able to choose for your fillup subtypes from gasoline (petrol) and ethanol group.