[Sunrise]

I need to develop android app of displaying on the screen of comparing fuel and electric vehicles. I am considering parameter as fuel cost versus charging cost. Can I determine charging cost from state of charge, battery voltage or battery current? I can get these values from CAN messages.

Can anyone suggest me ideas on how to approach?

 

[Sunrise]

Pretty much as Paul said. Miles per kWh of electric, compared to miles per gallon.
Electric at whatever price per unit, and fuel at current petrol/diesel prices.

To get to the miles per kWh I think you need to know the starting point, ie. the max usable battery capacity, then work backwards using the state of charge. Presumably you can pull mileage out of the CAN messages ?

Can you please elaborate on how to calculate miles per kWh?