Driver for mileage

The Ram is killing me with a whopping 12-13mpg. We are looking at picking up a Toyota Yaris for a daily driver. It's supposed to get approx. 32 city and 35 highway but I have friends that are getting around 40 on the highway. They run about $12.5K + T&L. If you want the power package, add about $1300-1400. We are also looking at the Chevy Aveo. I know they are not Mopars but desperate times call for desperate measures. We have ruled out diesels and hybrids at this point after looking at initial costs and ownership costs over a five year period. As for the Caliber mentioned, we rented one recently when we went to Spring Fling and the best we could get out of it on the highway was 26.5mpg.