Change to compare fuel costs

Experiment with showing comparative fuel costs based on user input
EPA EV data
Change to weekly cost and add y limit

Change from daily to weekly cost of fuel. Set so y axis is at least 40
and does not adjust downward if the max displayed cost is less. If the
max display cost is greater then adjust upward with a buffer of 5.0.
Helper function to compute daily cost.
Update for new daily cost function name.
Correct 2nd call to compDailyCost to pass all parm

Second call to compDailyCosts was still only passing the first two
parameters. Update so fuel costs are also passed.
Remove commented code. Update labels.