A new study shows Virginia has the most expensive interstate toll roads per mile.Preview: Check your return on investment before signing the dotted line because federal student loan interest rates are their highest in more than a decade. The Education Department announced Tuesday that rates for the 2024 through 2025 school year hit just over six-and-a-half percent, up from five-and-a-half percent from the previous year. Graduate student loan rates are also up, over eight-percent, more than a percentage point from the previous year.