Buy straight methanol at your local speed shop and then dilute your 10% 1 to 1 to get 5 percent nitro. Be sure then to add castor or Klotz to bring your oil up to 18 or 20 %. Works for me in my 91 and 1.08 ASP's and 90 Como, and results in cheaper fuel than buying 5% pre- mixed. Good luck and don't forget to add the extra oil.