 Now, cops say the fire was started by an explosive device Monday evening. The blast blew out windows and doors. Edgerton facing several charges now, including arson and vandalism. Gas prices dropping slowly, steadily throughout the July 4th week. Right now, the average is $3.42 a gallon. According to GasBuddy, it's $3.15 in Centerville and $3.17 in Huber Heights.