Yeah, after a week, I've determined it isn't very helpful to me based on my situation.
My cost per kilowatt-hour is $.196, so that gets rounded up to $.20. Based on 20 cents per kwh, the "cost vs. gas" is always exactly 1/2. It says it's using a national average for fuel (again, not very helpful) -- fuel isn't even remotely near the national average in southern California. According to the internet, national average is (at time of writing this) $3.44. Average in California is $4.49.
It would be much more useful if they allow another decimal point for the cost of electricity and if they were able to use regional gas prices. If it's simply going to double my electricity cost and display the difference as money saved, I can do the X2 math myself.