I've read a lot about mileage on this site for people driving in the city and for people driving on the highway at 65 mph. I'm planning on buying a hybrid (either a HCH or Prius) and will be driving through Utah and Nevada after that time. If you've never driven through Nevada, take my word for it, you will eventually go over the 75 mph speed limit. Does anyone know what kind of mileage a '06 honda civic hybrid or a '05/'06 Toyota Prius gets at 75 to 85 mph?