Was just entering a fill up, and somehow the total cost for the fill came to over $2000.
Noticed I left the decimal out of the price per gallon.
Here comes the reason for the this post. When I put the decimal in its proper place, the page altered the gallons field to match that $2000+ total cost figure. Change the gallons, and the price per gallon entry changes.
The fix is easy; just delete the total cost field, but I suspect this isn't the intended behavior.