He used to fill up his tank with $10 worth of gas. Today the gas costs him $15.(long sentence)
He used to fill up his tank with $10 worth of gas, but today the gas costs him $15.
He used to fill up his tank with $10 worth of gas. Today the gas costs him $15.(long sentence)
He used to fill up his tank with $10 worth of gas, but today the gas costs him $15.