My first full week of driving and I got 46.5mpg. That included some coasting down hill, but I think I can do better. So, I am looking at AMSOIL 0W-30 100% Synthetic Series 2000, http://www.amsoil.com/storefront/tso.aspx. However, this other website (which also sells oil), says "TOYOTA Echo engine which was NOT originally engineered to use the SAE 5W-20 motor oil", http://www.synlube.com/sae5w-20.htm (very last line). What do you recommend for the best MPG and engine protection?
Also, what is the recommended oil for the manual transmission?