Philadelphia gas stations charge over $5 a gallon. PHILADELPHIA - The pain at the pump just keeps getting worse across the Delaware Valley this week.Gas prices in Pennsylvania and New Jersey are even higher than Wednesday's national average of $4.56 - the first time all 50 states are paying an average of over $4 a gallon.The Pennsylvania average is up 7 cents from Tuesday, reaching a record high of $4.74 a gallon In Philadelphia alone, prices hit an average of $4.86 with at least one Philadelphia gas stations charging over $5 a gallon.