[Lazarus]

I've got to make a business trip, Austin, Tx-Wichita, Ks (560 miles) and will be driving a 2007 Chysler Sebring. Official EPA, new, values are 21/29. Here's the parameters to help with the guess. The trip up will be all highways miles. Time is a factor so I'll be driving the posted speed limit +/- 5 which is 70 mph most of the way. Forecasting north winds(headwinds) the whole way with warm temperatures. I'm not doing anything special to the car except tire pressures at 40 PSI. I'll be gone for about 3 weeks and will post my city driving numbers before I return and then post the return highway numbers when I get back.

So if you want to go all out you can guess highway up. City mileage while there and return highway.