If you've got a good charge in Omaha, you can get down to Topeka and get on the I-70 route. The problem is, the further West you go, the more difficult it is to get South to I-70. I ended up charging at a Chevy dealership in Holdrege, NE, in December (they used to sell the Volt), after leaving Lincoln with a full charge. Charging at 9mph was better than 4mph from a 110v outlet, and I needed every bit of it, to get down to I-70. The Superchargers are fantastic once you connect to them. It made the trip from Okoboji, IA to Napa, CA very, very nice.