5¢ of the 20¢ state gas tax goes to public education. The average driver pays $10 per month in state fuel taxes. While gas costs have tripled since 1991, the gas tax has remained at 20¢ per gallon, providing less money for roads as infrastructure needs have increased due to population and vehicle growth. The main sources of funding for roads in Texas are motor fuel taxes, vehicle registration fees, and federal funding sources.