Hi Sandy,
With price of gas in the US I'd suggest checking out the Alamo price with rate code RP as well as W9. You'll get a full tank of fuel ( worth USD 50-60 ) with the RP rate plus free additional drivers. To compare ... get up your W9 rate and then specify a full tank of fuel and see how that overall cost compares to the RP rate.

Also if you are renting for more than a week, are using the RP option on the larger vehicles and can fit the change-over into your schedule you might consider making 2 bookings ... renting for one week and the remaining time ... and changing the vehicle after the first week ... in this case you get another free tank of fuel for the second rental ..worth another USD 50-60.