I have only had the 05 Viper for 1 week today. Have already put on over 400 miles, now up to 7200! My job is only 4.5 miles each way so it's been a lot of cruising and giving rides to family and friends. This is my daily driver and only car. I would like to know what the lowest but safe cruising rpm is? It seems like the gears are set up in an interesting way where I am never able to go the speed limit and be in a gear which is low rpms but is not bogging the car down. I would love to maximize my gas mileage and wear on the engine by using 5th in the city and 6th on the highway but don't want to bog down the engine and possibly strain or damage it. So what is the magic lowest safe rpms for flat roads cruising? Obviously if I need to go up a bridge or hill I would downshift for power. Once I know what the correct lowest cruising rpms are I can try it out and see if a gear swap is necessary. Thanks very much in advance for your advice.