What is the gasoline tax rate? The gasoline tax rate is 26 cents per gallon. January 27, 2020 19:55 Related articles What are the new refund tax rates for gasoline and diesel? What is the deadline for filing an omnibus refund claim for petroleum taxes paid on petroleum products that are subsequently sold to a government agency free of tax? Which motor fuel tax forms are required to be filed electronically? What is the undyed diesel tax rate? Who is entitled to the tare allowance for motor fuel taxes?