I ran some numbers, hopefully I remembered how to use my slide ruler. Using the RAV4 numbers from above....
10,000 km city and 5,000 km highway @ $1.60/L = $1,408 (Hybrid) and $2,072 (Gas). Difference = $664
5,000 km city and 10,000 km highway @ 1.60/L = $1,448 (Hybrid) and $1,888 (Gas). Difference = $440