For truly accurate numbers you have to also add in the 75 cents per day FF mile surcharge. So you would be paying $20 more AND incurring the 75 cents per day.
Have you looked for another AWD that might bring the rate down a bit further?
I am just using my corporate AWD. Since I am under 25 and know that my corporate AWD waives the additional age fee, I figure it is easier to just stick with what I know rather than using another AWD where the fee isn't waived.